American universities have rushed to move as much lecturing as possible to adjuncts, and cap as many employees as possible at 29 hours/week to avoid the ACA. Just like with a fire-and-brimstone televangelist, it's only immoral if other people do it.
No, it's just plain immoral, not to mention short-sighted. American primary and secondary schools are also squeezing their teachers, by hiring Filipinos on J-1 visas, just like tech companies do with H-1Bs.
It's a bit like like making room in your fridge by pushing everything back, then adding new stuff. It works for awhile, but eventually leaves you with a mess of spoiled milk and rotten vegetables in the back. You can only strip-mine a hill for so long before it's gone.