I agree. Bursts of high emotion and trauma provoke him to 'rashly' attempt the Unforgivables, but I'm certain he would never intentionally use them. He's tried the Unforgivables twice now, and succeeded in using a Dark spell once, which has costed him gravely. Judging by his reaction when he learnt what Sectumsempra was, I feel he wouldn't take the risk again, even if someone close like Ron, Hermione or Ginny was attacked or killed. I think he's up to holding his impulses now... Things like the death in HBP could be a numbing factor - sort of putting him on the straighter path to victory.
So going on to the Unforgivables, I donít think Harry would use them unless he really needed to use them. We know heís not afraid to use them, thatís for sure, because weíve seen him try Crucio on both Bellatrix and he *attempted* to cast it on Snape as well. So heís willing to use them, but I think heís only going to use them if the person is doing something really bad, or has just killed someone thatís close to him.
Hmm... it depends a lot on
how do you think Harry would react to someone who had just saved his life (or Ron or Hermione's life), if he barely knows the person in question?
Would Harry be willing to trust him and even think about starting a friendship or do you think he will just thank him and maintain the distance?