I'd probably give more of a damn if I gave two shits about the F-35. Screw it, if our potential future enemy wants to give us a hand with one of our weapons systems, I'm OK with it.
This is somewhat reminiscent of the Sea Shepherds buying former whaling ships to use against whalers. Some people tried to conjure up phony outrage when the M/V Sam Simon was bought in secret from the Japanese government. Fight fire with fire.