Hanlon's Razor

I’ve been familiar with Occam’s Razor for some time ("Entities must not be multiplied beyond necessity"). Last night, we were discussing group dynamics and someone tossed out Hanlon’s Razor. I wasn’t familiar with it and looked it up (“Never attribute to malice that which is adequately explained by stupidity”). It’s common to attribute recurrent malevolence to some kind of mental defect, but there’s probably some truth to this.