I've seen similar situations of people flouting minimal in-office requirements.. and it is strange that they don't expect pushback from management... I think the attitude is there is no one really "keeping score" and it's really "no big deal" because "I'm getting the work done." But still, rules are rules, and that seems like a fairly simple one, especially considering what we used to have to do just a few years ago--endure commutes every single day.