even if i am shooting in the sea, unless i know for sure the tripod is very stable, i hold on to the strap. this is so that i did my best to protect and take care of my equipment. won't want to feel stupid later on.
if say, a cat jump on the seat and push the camera off, is he going to take picture of the cat and stomp it?
if got blind man sit down, and push the camera off, is he going to kb the blind man?
if the camera slide off, is he going to do a self portrait and kb himself?