You still stuck on the RTS? Those people have been dealt with long ago. The Alliance hasn't had any evil deeds since (its been more than 12 years). Unless you want to count that night elf idiot that wanted to be friends with Ragnaros.
Or... do you want to compare the concentration camp to nuking an entire city?
So, yes, in WoW the Alliance has only showed good integrity. Even Jaina calling for the disband (not slaughter) of the horde. Actually, it would be the best for the horde itself as the races banding together and just doing the bidding of power hungry warmonger warchiefs isn't doing them any good either. Still... it didn't happen.
Actually, WoW Alliance has always been on the defensive side. I don't think they attacked horde territory a single time ( except the siege of O, but that was a joint with the horde races).