I've backed 8 campaigns in Kickstarter and 3 of them were shady cases - all backers incl.me lost their money. I posted them questions numerous times but nobody cared to answer neither campaign owners nor Kickstarter.
Definitely Kickstarter has to monitor the campaign and when something goes wrong should step in and clarify. No, they're just collecting money from campaigns and don't invest efforts to filter scammers. These are scam-cases just within last 6 months: CXBER, UGAST and SYINNO.