When revolvers dominated defensive carry weapons most professionals relied on their double action shooting and only used single action at long range when DA shooting wouldn't get hits. A few people liked to have the hammer spur removed on concealed carry or pocket guns but most savvy people knew to just put their thumb on the hammer when drawing(especial from the pocket) to prevent snags. Some large police departments (NYPD) started ordering all their guns with the hammer spur removed so the officer would never be tempted to cock it. I heard that after a police shooting, sometimes an attorney would tell the jury "the officer didn't mean to shoot the suspect, he cocked his gun giving it a hair trigger and it went off accidentally".