*bleep* vs no *bleep*

since when can tv characters say "dick" on cable? i don't mean "my name is dick". i mean "this homeless guy showed me his dick today". this was said at 9pm which isn't late night and technically children can still be awake. although this was said on cable and i swear myself, it still surprised me.

and why is nigger/nigga (whatever the hell you want to call it because it's the same thing to me) acceptable?!

and if all of this is okay, then why was "shit" given the *bleep* and/or voiceover to be "shtuff"?

explanation, please.