The fault lies on both sides tbh. While people should absolutely be more careful with what they wish for and sometimes get exactly what they deserve, the Ahamkara don't care who it brings harm or joy to. The wish of a saint is just as worthy as the wish of a psychopath. They are like children with a magnifying glass at an anthill. There really was no other option. Send them off to other parts of the galaxy (and have them wreak havoc there), keep them contained (worked so well with Riven) or exterminate them to ensure their power can't be misused by anyone. Don't get the wrong idea about Ahamkaras. They are NOT guilt-free. If they exercised more restraint in their wish-granting, the Great Hunt would've likely never happened. Ahamkara had the power and intelligence to avoid that outcome, but they lacked the will and discipline to make it so. It was an unfortunate outcome created by many factors.