Personally I would, I wouldn't do anything too crazy, no huge jumps, but yes. In the spirt of 90's Extreme and Jack Ass I'd ride them. Up to 20mph on a trail or road I'd have no problem.
When you see the state of some bikes and tyres, and when I think back to being a youth when we didn't change a tyre until the carcass was worn through. Sure they'd be okay.
In todays world I'm sure folk would say "No"