I mean, I don't even mean it to be insulting or anything. People can't be good at everything. It seems that police I've met so far (n<10) are pretty awesome people, but they don't seem to be particularly security conscious qua electronic security.
Else the police chiefs would (for one) realize that they need that end-to-end encryption themselves. It's a fairly basic building block, you'd think.
OTOH, maybe my impression is wrong, and there are exceptionally skilled police people who I've just never met? But why would they be advising their chiefs so badly then?