Hanlon's razor is a bad heuristic. It ignores the very basic fact of human existence that Power is more addictive than heroine and more alluring than the Ring. Assuming power hungry fiends are just stupid is at best naive.

He is not saying they are malicious in their intent. The policy can still be attributed to stupidity/ignorance. The issue is that once given the power, it will be abused. Never trust anyone to point a gun at you or string a sword above your head. It will be abused at some point.