Except the USAO is reviewing the cases, and they're determining that in 70% of cases they can't make a case. And in some nonzero number of cases the reason is precisely because of the shitty police work done by the arresting officers.

So in your analogy your boss is reading the proposals and rejecting 70% of them, some of which because they're illegible and nonsensical. And if someone called you out as being a shitty lazy policy proposal writer for not writing policy because of it they'd be entirely correct, just like people calling out lazy shitty cops not doing their jobs would be.