RE: Disturbing sign
I don't find the sign offensive at all. Everyone gets their feelings hurt too easily now days. Just take it for what it is, a reminder to be safe and go on. I know as well as you that the deer camps get out of hand all the time. While most hunters go afield sober, there are a good number that take to the wood drunk as monkeys.
I see no difference in a billboard saying if you drink don't drive. Most people don't drive drunk but some do and it's just part of the education to bring awareness to use all on the subject.