Aggression is part and parcel of the human animal. Limiting its excesses would seem to be the task at hand not "killing" or "removing" it. A lobotomy removes all aggression period. Is that what any of you would want for yourselves, for your progeny or the rest of humanity?
Self interest, the drive to survive, is the key to all human achievement, as well as true peace and prosperity. Aggression (willingness to harm others) very naturally springs from that as well, but is not the same thing, I think. I've known a great many people with incredible drives and honest self interest who would not dream of harming another person. The trick is to keep them separate, I guess.
The great evil is the lie of "altruism," the subjugation of all true self interest to the hive mentality. Since it is nearly impossible to destroy the self, without being dead, those who subscribe to this philosophy become more or less bitter, angry, resentful, and become aggressors, even if only by proxy.
Seems to me that the answer to that is self defense, for starters, and refusal to feed the hive as much as possible. Can non hive humans survive, let alone win out over the collective. I don't know, but I have a lot of hope.