JW's are stumbled when a man in the congregation grows a beard, because they are told to be stumbled when they see a beard.
If tomorrow they were told not to be stumbled by beards then tomorrow none would be stumbled.
Even the term "stumbled" is an exaggeration used to coerce and control.
If you are stumbled then you stop going to the hall or on the ministry.
The worst that happens in the congregation is that some are "surprised".