In the wake of the fatal police shooting of a homeless man on Shotwell Street in the Mission District, San Francisco Mayor Ed Lee is declaring all homeless tent encampments to be safety hazards and has ordered his department heads to draw up plans for a systematic citywide takedown policy.

“Once the various investigations have finished collecting evidence and completed their interviews of witnesses, I will be ordering the Shotwell camp to be taken down and for it not to come back,” Lee told us.

“It is also time to focus on why the police were called to the scene in the first place,” Lee said, declaring that the city needs to deal with camps where some people are carrying weapons.

People living near the camp on Shotwell between 18th and 19th streets told a Chronicle reporter that 45-year-old Luis Gongora had been living on the street there for several months before he was shot by police Thursday.

Police and witnesses agreed that Gongora had a kitchen knife when officers arrived, but disagree on whether he was a threat to officers. Two officers fired seven rounds at Gongora shortly after shooting four less-lethal beanbags at him.

It was the second time this year that law enforcement officers were in a confrontation with a homeless person wielding a knife at an encampment in San Francisco. In February, a California Highway Patrol officer was stabbed in the neck and badly injured, allegedly by a homeless man living in an encampment near the Bay Bridge.

“It’s not just that people do not feel safe around the camps — they aren’t safe,” Lee said.

In February, Lee declared a public-health emergency as justification for removing sprawling tent encampments along Division Street. He told us he now considers all homeless encampments to be public safety hazards and will be enforcing the edict citywide.

“When it comes to public safety, I’m not going to compromise with these camps,” Lee said.

“We did it on Division. We sent in the teams, everyone was given a choice of a place to go — and by the way, I’d like to point out that no one was arrested,” Lee said.

Whether the mayor can keep that batting average remains to be seen. At this point the plan is to pick the camps off one by one as shelter beds open up, with the first “hot spots” to be selected by police and health and public works officials.

Still, the plan appears to be far from complete. The 180-bed shelter at Pier 80, for example, has only 20 empty beds. An additional 93 shelter beds are expected to come online in the next six to eight weeks.

“It’s not going to happen overnight,” Lee said.

Lee’s critics, such as Supervisor David Campos — who recently called for the declaration of a homeless state of emergency intended to lead to more city shelters — were leery of the mayor’s position.

“What we saw on Division Street is that many of the people living there just moved somewhere else,” Campos said. “I wouldn’t be surprised if the camp on Shotwell had moved there from Division Street. We keep moving them because there are not enough places for them to go.”

Lee said he expected the criticism.

“I know that some people will say, ‘How come you haven’t done this in the past?’” Lee said. “But I first wanted people to know that we do have alternatives and that we expect people to take them.”

More than half of those surveyed last month in a citywide poll conducted for the San Francisco Chamber of Commerce declared homelessness and street behavior their top concern, overtaking affordability as the city’s most pressing issue. Last year, the total putting homelessness at the top of the problem list was 35 percent.

The discontent has also contributed to a big decline in the mayor’s own ratings, with his favorability number in the chamber poll dropping to a low of 41 percent.

A’s-ball: After more than a decade of going in circles, Oakland A’s managing partner Lew Wolff is taking a backseat in the drive to get the team a new stadium and handing the job over to largely “silent” majority owner John Fisher.

“John is spending a little more time looking at the alternatives on the venue,” Wolff told us. “Having some fresh eyes relooking at Oakland is a good thing.”

Fisher appears to be interested in a stadium closer to downtown. But Mayor Libby Schaaf’s push for a new ballpark at Howard Terminal north of Jack London Square looks like a dead end from the team’s perspective because of poor BART and freeway access.

The team is still exploring a site at Laney College, which is within walking distance of the Lake Merritt BART Station — but that would mean buying the land from the community college district.

The other option, of course, is staying at the Coliseum site.

Team spokesman Ken Pries said Fisher “is not willing to make statement or do an interview at this time.”

With Major League Baseball breathing down their necks to get something done, the A’s are hoping to make a decision within the year.

As for the 80-year-old Wolff, he isn’t saying how long he intends to stay on as managing partner — but he is emphatic that he has no intention of selling his minority stake in the team.

San Francisco Chronicle columnists Phillip Matier and Andrew Ross appear Sundays, Mondays and Wednesdays. Matier can be seen on the KPIX TV morning and evening news. He can also be heard on KCBS radio Monday through Friday at 7:50 a.m. and 5:50 p.m. Got a tip? Call (415) 777-8815, or email matierandross@sfchronicle.com. Twitter: @matierandross