President Trump performed a public service last week by highlighting the causes of exploding homelessness in California. Democrats aren’t taking it well, but this is a debate the U.S. and especially the Golden State need.

On a visit to San Francisco last week Mr. Trump warned that the Environmental Protection Agency might cite the city for pollution in the streets. The city council has banned plastic straws, but the good liberals don’t seem bothered by streets strewn with human feces and needles that fall into storm sewers.

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