She may have shown some poor judgement, but statistically, she is almost certainly correct. Some not insignificant number of her students will commit crimes - become criminals.
As others have pointed out, virtually all of us are criminals in our big-government socialist state. There are so many laws on the books I'm sure we're unknowingly violating some. I know I will probably drift a few mph above the speed limit on the way to work. I will be listening to music played from a device that, well, I'm sure the RIAA or some such would claim stretches the bounds of "fair use." etc. etc.
Certainly, she's not saying her students will one day use illicit lightbulbs or drive over the posted speed limit. I assume she's referring to more blatantly anti-social, atavistic behavior.
These days, there are things I will not say to anybody but my father - alone with him in a car, with the windows rolled up. Or I will share it with God in the privacy of my silent prayers. But I won’t say them where they can be heard by anyone else.
Posting on Facebook should ALWAYS be uncontroversial. I won’t link to job news or opinions, political items, guns, etc. Cute cat videos are okay. News on interesting science (like that anti-viral medicine breakthrough) are good.