Hanlon's Razor is just a heuristic. What is the reasoning for following it? Or do we just blindly follow an age-old adage because it sounds philosophical?
In the vast majority of cases, the logic behind Hanlon's Razor held. Many times I assumed malicious intent and was proved wrong. As I've gotten older, I've assumed malicious intent less frequently.
I think "people that don't assume enough malicious intent" are a real thing, so I think Hanlon's razor is not an universally good recommandation.