I haven't read every message in this thread, but did scan pages 2-4 to get a sense of where it's gone.
First of all, I think it's useful to acknowledge that this line of inquiry may very well imply a judgemental attitude, conscious or not - I'll let you each decide for yourself. Maybe a better question is when one would let it go. If someone has been in the organization for decades from the time of infancy and have not 'worked on' it in any way at all, it's a little unreasonable to expect them to let it all go in 5 minutes, don't you think? Of course, in any given moment we may be free from any thought created mental stress, but overall things like this does come back up.
This leads into the difference between letting something go and repressing it. While the question of why you can't just let it go is a good one, if you're honest with yourself the first thing to see is that no, you can't let it go, not right now. If that is in fact the truth in this moment, no amount of influence from others and anything they'll say will make you let it go, you can't let something go if you keep pushing it away, because it never got as far as your sphere of control so that you can let it go - if it's unconscious it will just come back to haunt you.
The bottom line is, this is something that is a challenge for most people, regardless of the form it takes. Someone may be offended that another person slandered their God's name - well why can't you let THAT go? It's irrelevant whether the issue is a religious one or not. Most people hang on to something, so if we're talking about letting go then just about everyone has something to work on. If you're really free and let it all go, you'll let this question go, too.