i mean, stripped bolt for the steerer clamp....... i think the most likely accident is you hit a bump and suddenly you're bike is turning a hard left and you can't figure out why cos youre steering straight. happened to me once just from loose bolts. i think its very unlikely that you and your bars would go flying off your bike together. you can put a ton of pressure on your bars when the stem isn't even clamped down and its not gonna just snap off.

of course this is said from a point of view of desperation. if you can get to a bike shop and buy a new stem or fix it somehow tomorrow, or ride a secondary bike for a while, i'd opt to do that.

it might be an easy fix with a few nuts and bolts at the hardware store - but beware, they don't tend to have much fine thread stuff like most bolts on bikes. and i doubt they'd have anything smaller than what you already had to fit thru the hole. i'd sooner opt to go to a bike shop with used parts bins and try to find nuts and bolts there.