I really believe that these incidents are either caused by a lack of education/training/awareness or individuals just not caring. The first group can be fixed with some training, counseling, etc. Too easy. The second group is a little tougher to get a grasp around. They are the ones who just don't care. They have reasons like:
"I posted it after I got off work...I wasn't on duty"
"It's my personal account and I can post what I want"
"What I do on my own time on my own computer if my own business"
"It's my 1st amendment right to do express myself how I want"
These are just a few of the excuses that I have heard. This is a mind set that needs to be changed in order to get the results needed. It will take more time and effort than just the standard "wake-up call" that we give to the folks who are just not tracking the rules. If mind sets do not conform to the standard, then there are avenues available to CDRs and leaders to punish and/or separate.