I prefer the more mean spirited "aggressively stupid", but I don't want to tempt a splintering of the "Hanlon's razor" people - I'm quite happy with the mental image I have of them already.
1. Not malice but incompetence
2. Actually malice, trying to make it look like incompetence, but being incompetent at that makes it... both?
3. Actually being competent at feigning incompetence (the ultimate malice?), perhaps we need to develop a new 'razor' for that.