I've got several issues with your reply and I'll address them one by one.
First of all, the spelling is wrong
Secondly the grammar is terrible
The word "should" must be stricken from use, as it means nothing other than some random person believes that something be done a certain way, regardless of the fact that there are no laws or rules requiring that it be done that way.
Finally, it's an expressed opinion, nothing more and isn't substantiating by any supportive logic and reasoning (like most of the replies on this thread).
Try something like this next time:
In my personal opinion a diver must carry a tourniquet as a safety measure, and while it may never be used in an entire diving career, if and when it's needed for yourself or another diver because (for example) they caught their leg on a rusty piece of wreckage or are attacked by a shark, you'll be glad you have it.