Well your opinion is your opinion so that's fine. I disagree completely thought. There's a time and place for everything. My boat does 70. That doesn't mean I do that always even when it's completely safe for me, the public, and all of God's creatures for me to. There are absolutely most definitely completely idiotic people that are going for every tenth they can muster regardless of the conditions and yea I agree that's stupid. Speed limits on the water would be stupid though. the same people that suck at 70 are gonna suck at 55 only now they are likely in a smaller boat that's less capable in rough water. Most likely. Not always.
Anyway I was mainly just curious. I didn't know if you meant at dark, or specific situations or what.