A lot of young children will have accidents because they forget, or don't want, to go to the washroom. That's true even if it is urgent. (They either don't know what their body is telling them, or they are fearful of washrooms, or they are simply having too much fun to be bothered by what their body is telling them.)

Its simpler than you think:

No one really regrets going to the bathroom when it isn't urgent.

Plenty of people regret waiting until it gets urgent.

Reminds me of when I interned as a medic. My instructor gave me a list of rules:

Walk, don't run.

Never trust the public in a vehicle.

Always check the rigging yourself before rapelling down the embankment.

Sleep when you're tired.

Eat when you're hungry.

And never, I repeat, NEVER wait to pee.

When you live in a world where you may have to scramble at any moment, and you work 72 hour shifts, you can't take simple things for granted. We might go from chilling on base to not being back for 15+ hours.

I remember my biology teacher telling me of the dangers of being a car crash with a full bladder - yet another reason to go.

If something unexpected happens and your saw kicks a board back at you, you don't want to piss yourself as well as screaming

Think before you act.

Take your by own advice ;)

Don’t pass up a chance to pee is the advice in question.

Which I’d equate to; Better safe than sorry