I shouldn't do this, but it's fascinating and it does pay to know one's ideological adversary. I believe the protesters at Pride are a part of this group, the Street Preacher's Fellowship.
Now, I rather enjoy these protesters and fully support their presence at PrideFest. I believe in free speech and in the right of someone to yell stuff at someone else. I also believe that these people ultimately help us, because clearly, they're a little nutty. Okay, that's dismissive, but still their rabid homophobia and bizarrely literal reading of Judeo-Christian Scripture can easily be refuted. In some ways, at least to me, that makes them harmless.
My only concern is the potential damage to young people. It's difficult to hear that kind of stuff when you're young and unsure of yourself. Of course, we can't live in a bubble full of loving and supportive people. But most gay people don't, never have, and never will.