I have seen many threads about a bobbed hammer on SW revolvers, I have several and cannot imagine not being able to cock the hammer and shoot single action, I understand that there is no chance of catching the hammer on clothing but if carried right or pulled from the bedstand. It never happened to me and I never even considered it. Will someone educate me on this issue
Don't quite understand your question, however your comment
"I have several and cannot imagine not being able to cock the hammer and shoot single action" concerns me with respect to a defense gun.
My opinion only, shooting single action with a DA revolver should be relegated to sighting in, bullseye competition and possibly hunting (long range shots). Other than that, a DA revolver should be shot DA, it's quicker and is not less accurate, assuming you learn to shoot DA consistently and practice that way. I do not see any reason to shoot single action with a defense gun, cocking a hammer and holding the gun on a "suspect" is asking for trouble, aside from what is seen on TV police and detective drama shows.
On exposed hammer on a defense gun can be a liability from a clothing standpoint, the only good use frankly is to use it to "power through" some kind of action issue, i.e., the gun is gritty, not shooting smoothly due to dirt clogging up the action, high primer, etc.
While it's a bit more challenging to shoot DA accurately, it's a good skill to master, good DA shooters can shoot SA with little challenge, but if you only shoot SA, then if you really need to pull a gun with little time to cock the action for that first shot, you may not have the time to prevail. Pull the gun, pull the trigger, put the bullet where it belongs and stay alive. Shooting DA is the answer, and for that you don't really need an exposed hammer.
For what it's worth, just one guy's opinion.