well, i don't know about the 'we' bit, these guys aren't far off the crazy guy yelling at people with a 'the end is nigh' sign around his neck.
Full marks for everyone who believes and follows something bigger than themselves.
I've seen some of these street preachers in action, I wouldn't say they were preaching as much as they we're just giving everyone in earshot a good telling off for being filthy sinners.