It is not tree hugging to think its wrong to shove a pipe down an animals throat and use a plunger to shove the food down its throat to cause the liver to expand.
I am not familiar with the history of Fois Gras was available in the time of the Gemorah, nor was much of the industrialness of todays meat processing. If you think its OK to shove a pipe down a birds throat and use a plunger to force feed it for your gastronomical enjoyment, then you really have no compasion