If you weren't flying the plane, haven't inspected the wreckage, and haven't interviewed the pilot, you have no idea if the plane was controllable or not. You also have no idea if the empennage was structurally sound enough to withstand any control input, assuming the controls were actually intact after the collision. It is entirely possible, even likely, that the controls could have been severed in the collision, and that the empennage was no longer structurally sound.
Even FAA and NTSB experts don't make assumptions strictly based on the information you people have available, and they know a lot more about the subject in question +than 99% of the people who frequent this BBS.
If your plane is hit in a collision, then you suddenly feel the controls go limp in one or more direction/function, and you're 500 feet or less off the ground, you bail out immediately, if at all possible, it's called common sense and self preservation.