I suppose that something like that could work its way into a tire and cause a leak.
Those kids really should have used roofing nails if they wanted to do the job right... They can easily find their way into the tire and they make that loud annoying "click, click, click" sound as you're driving down the street.
This is one of the problems with kids nowadays, when it comes to vandalism, they don't know what they're doing.
I wonder what those pieces of wire came from?