Why does law enforcement say "baker" when military says "bravo" (and so on)? I don't know why that irritates me so bad.

Because they're using the pre-1957 phonetic alphabet.

http://olive-drab.com/od_phonetic_alphabet.php

American phonetic alphabet instead of international.

I think police forces are already way too Militarized so to use baker instead of bravo is just fine, they shouldn't be just like us, we are here to defend the USA , they are there to protect and serve their communities.