The "stimulus" destroys jobs, it is a leech on the economy.
When a blind fat man gets depressed, you console him first. You don't immediately put him in a go-kart with a fistful of antidepressants,a bottle of gin and a sword in order to combat the lack of euphoria that caused the depression.
The government can borrow at 2.5% for 10 years. It can buy time that indivuals or banks cannot buy. If that time is used to let the economy recover a little and then make structural reforms to reduce debt, the idea can work.