Can they just erase the crappy memories? ;-)
They might erase too much.......oops!........
The only problem with that is that you might end up repeating whatever it was that created the original bad memory.........
Kinda like forgetting that your one night stand with a gal resulted in a STD and a case of the crabs then running into her in a bar and asking her out again.......bad memories are there for a reason. LOL!