Says who? I think you are misunderstanding the post you're responding to. Trump's goon walked through the banner the other guy was holding, then stole the banner out of his hand.
In that case the sign was probably seized so it couldn’t be used as a weapon.
Who gets to determine whether the sign could be used as a weapon? What right did Trump's good have to take the sign?
Okay, maybe I misunderstood the situation.
Sounds like Trump’s guard might have overstepped the law and committed an assault. But I’m guessing they are trained pretty well, and I’ll wait for the investigation if there is one.
Was the banner being used to impede the right of way onto Trump’s property? If so, then security had every right to remove it.