
Stolen political signs? Cry me a river...
The only case I can think of where removing a political sign isn't technically benefitting the public is if they're on the property of the person who placed the sign or gave permission for it. Most are in public right-of-ways, where legally they're classified as litter. I really wish they were specifically called out as illegal "street spam" and prosecuted. It's not like someone will say "hey, I've seen 200 signs for ____, therefore I should vote for them".
At least the corrugated plastic ones can be glued together to make pretty good boffer shields. I picked up a bunch after the last election.