You are so misinformed about trees. Each year we tap the maple trees and remove as much of the maple sugar sap that they can pump out. It does not hurt the trees. Trees substain damage from animals more than people and the seem to survive and fourish. I would suggest you put little bandaids on all the wounded trees you see and make them all better. Remember the big storm here in buffalo all them trees seem to be doing okay even thou many of them have more than 1/2 thier branches snapped off. They healed and are now doing very well. WAAAaaaa thare's a screw in my tree.