Can you cure Neville's parents by...

...taking their memories of the attack? In the Batman comics, Emperor Joker (basically Joker with all 6 Infinity Stones) tortures and kills Batman over and over again till he becomes catatonic like the Longbottoms. Superman fixes him by just taking his memories. Would this work on Neville's parents? Why or why not?

Also side question: why was this type of thing not done more often? Cartels often film and put out videos of their own attacks as a way of saying "look what we do to our enemies, you wanna be next?" The attack only took a matter of hours and they were permanently left that way. Soooo why not just torture rivals and return them all fkd up left and right?

One more question too: when Voldemort returned to power, why didn't Bellatrix and her co-conspirators go to St. Mungo's and fk them up some more?