We have had a huge amount of damage due to squirrels here in Denver. The past 2 winters have been extremely mild here and we have been hit with a bumper crop of vermin of all sorts. They take trash out of our alley dumpster and then leave it in our trees and yard.
Squirrels can also carry some extremely dangerous diseases that can be transmitted to humans, ie.
Bubonic Plague, Rabies, etc. I had to just go ahead and drown the squirrels as I just can't make that many 20 minute car trips a day to relocate them. I found a plastic tub that the cage fits at Target and kept it filled with water.