it's because they refused when the cops requested that they do.

I think of it like this...

There's a stranger on my lawn and I call the cops. While the stranger may not be doing any harm...as the owner of the property want him removed. whatever the personal opinion of the cops are...doesn't matter. Their duty is solely to enforce the law. Let's say the cops go up to the stranger and say...

"Look man, we no the homeowner is being an asshole but you have to get off his lawn" The stranger says "no. I'm not leaving"

what's the cop suppose to do?