Do you actually think I'm going to bother to learn any of the names of the little snowflakes that I will see for a few weeks out of my life? They’re not that important. Go in early and take attendance? None of them will be there. That minute you say it will take is a minute I could be thinking about a Browning sonnet. Or beer. Most likely beer.
My institution use to have a policy that if a student missed more than six hours of class time they could be withdrawn by the instructor. Then some asshole in middle management decided that was unfair to students who only enrolled to keep their full time status and collect grants and loans. The result on attendance is just what you would imagine.
Learn their names? No. Take attendance? No. Give a shit about their grades? No.
Teach to the best of my ability and then go home and play with the dog? Damn right.