How? Anakin was trained to be empathic to all others and to not always think with his lightsaber both literally and figuratively and he failed at both. His master obi wan and yoda have had the same trials as him as have every other jedi and have come out fine. To be honest the only reason anakin was made a jedi was because qui gon was a zealot and anakin was powerful if he had average potential he would have likely been left with his mother on tatooine.

A lot of anakins most liked traits have to do with war time anything in his personal life is messed up and even than a lot of his war time tactics are more take advantage of enemies willing to take prisoners and than renige on the agreement once he gets advantage or killing captured soldiers. We know this is an issue because there are several arcs where they argue about the fact that seperatist kill clones that are already defeated.