I am not concerned about the fact that it is deer, but that it is meat, and cooking to a certain temp will kill any bacteria that may have found its way in via dressing or processing. Mostly this is only a concern for ground meat where outside is mixed with inside meat. For steak, just cook the outside fairly good leaving the inside medium and there should be no problem since any bacteria will stay on the outside and be killed.

Yeah, the twitching guts by themselves probably have little to do with the health of the deer.