I'm with you, brother. Free speech, public areas, blah blah blah. But hey - that same free speech protects counter-protesters who can (and should, IMHO) block their stupidity from view by the family of the dead person.
I have read that this is how they keep going...a number of them are lawyers, and they sue other people who try to block them. A disabled vet in KS was in jail a bunch of days before he finally bonded out before Christmas because they had him arrested for picketing them. (Don't remember all the details; you can look it up.) Anyhoo, they're slick. And sick.