Unfortunately the public stinks and they cause a great deal of this.
Automotive techs get mercilessly badgered all day long from a cheap populace. "Can't you fix it for $5 less?" Nobody wants to deal with that, so by default many of them proceed as though each customer will yell and scream over a dollar or two; because many do.
I realize that this instance is a safety issue and should be a "no go" in any case, so guys do not think that such escapes me. I am just saying that I also empathize with the techs who are obviously frustrated with being badgered to death by dummies who have no problem riding on that wheel.