A manifesto, allegedly posted by Patrick Crusius, the El Paso shooter, claimed that he was acting, among other things, in defense of the environment.

"The American lifestyle affords our citizens an incredible quality of life. However, our lifestyle is destroying the environment of our country. The decimation of the environment is creating a massive burden for future generations," the El Paso shooter wrote.

"This phenomenon is brilliantly portrayed in the decades old classic 'The Lorax'", Crusius wrote, citing a children's story commonly used as a text by environmentalists.

"Fresh water is being polluted from farming and oil drilling operations. Consumer culture is creating thousands of tons of unnecessary plastic waste and electronic waste, and recycling to help slow this down is almost non-existent," he ranted.

"We even use god knows how many trees worth of paper towels just wipe water off our hands. Everything I have seen and heard in my short life has led me to believe that the average American isn’t willing to change their lifestyle, even if the changes only cause a slight inconvenience. The government is unwilling to tackle these issues beyond empty promises since they are owned by corporations."

At this point the El Paso shooter seems to be channeling Elizabeth Warren or Bernie Sanders.

"Corporations that also like immigration because more people means a bigger market for their products. I just want to say that I love the people of this country, but god damn most of y’all are just too stubborn to change your lifestyle. So the next logical step is to decrease the number of people in America using resources. If we can get rid of enough people, then our way of life can become more sustainable."