It's not their dissatisfaction with those particular (most-permissive) licensing choices that they are signalling. Rather, it's the tangled mess of other twisty

It's not their dissatisfaction with those particular (most-permissive) licensing choices that they are signalling. Rather, it's the tangled mess of other twisty-licenses and license-interactions and license-debates (like this one) that they've had to navigate. You're essentially suggesting they should just shut up and maximize others' convenience. OK, that's a valid opinion, and if their only goal is maximal reuse, CC0 is great. But their choice of crazy-ass license is an expressive act, like the coding itself, and you haven't established why your convenience trumps their other expressive goals.