why

Andy Rooney moment:Why is it that people who put bumper stickers that offer positive, life-affirming advice, such as "Respect Life" and "Visualize World Peace," are typically, to a person, consummate assholes? Or is this question redundant because anyone presumptive enough to preach via a sticky paper placard from the back of their car, guaranteeing a captive audience in traffic, is by obvious extension an asshole? I'm stuck on a Mobius strip here, I think.