At salaried level people aren't doing things that have hard time constraints. when you are delivering pizzas or working as a cashier your punctuality matters a hell of a lot more, it doesn't take a genius to figure that out, which is why if you fuck up once you're fired, it was literally the one thing they told you not to fuck up.

Of course there are extenuating circumstances, and managers should be more relaxed with people who make an effort (e.g. texting ahead that they are running x minutes late). But the vast majority of cases are not like this. Its people making stupid choices and suffering the consequences, I don't have much sympathy for that.