So, they do all sorts of stupid stuff, like walk into the middle of the road and get hit by cars, rub the bark off tree trunks and eat all our flowers.
This statement is passive aggressive and clearly establishes his stance in the article. It show that he believes that Trump and the situation in San Fransisco is "stupid". He maintains his light tone, which allows the reader to look forward to reading what could be seen as a not so entertaining topic.