It really ought to be illegal to picket at a funeral. This idiot has found a way to get in front of a camera whenever he wants and he doesn’t care how many grieving people he hurts to do it. There should be a news blackout on his obscene behavior just like there is when drunk fans may climb onto a football field and do stupid things. If he didn’t get any media attention and kept getting arrested for disturbing the peace then he would eventually stop.
States have tried it and courts have overturned it.