I can't judge what is justifiable or not. The company isn't very public about what what they have on these guys either, so I presume neither one of us knows everything. I would say that if you're going to call off to go hunting, don't post on a public Facebook page something to the effect of "sorry NetJets, I have better things to do" with a picture of yourself wearing camo and holding a rifle the day you call off sick.
Sure, many rules hadn't been enforced for years, but that doesn't make it ok either. I don't know if these were first offenses either.
There are the 3%ers, then there was one dooshbag. The only one I could truly say was a dbag in my 14 years with the company. He was the guy that caused his brothers / sisters to work harder nearly every single day he was on duty in addition to the few things I mentioned. I don't want to see anyone of you guys out of a job, but I was elated when he left.
Back to the original point many posts ago. Less than a dozen terminated is hardly a management campaign. I Don't know what tactics are being played, or why. If you're telling me that you believe there aren't a few that have the intent to truly hurt the company, you're lying to yourself.