Bent in which way?
Rear triangle on a steel bike can be straightened out if you are careful.
Front triangle shouldn’t have issues unless it’s bad from the start. (that requires a table and skill)
Only bike I have straightened was a steel huffy (not worth working on)
It had a head tube that was twisted so wasn’t fixable… Rear was easy enough to align though.
Ronald Raegan’s headstone, where else?