I'm sure (or I hope) that better economic minds than yours (no offense intended) have considered various methods of stumulating the economy, and for whatever reason, they went with this one. I wish I was better informed about the subject, but unfortunately I (as many others, including you) am not... so there's really not a whole lot more that I can contribute to the conversation.
Oleg, what exactly did you find so amusing? Borrowing and spending money that they don't have, is exactly how investment banks make their money.