As someone who was a fat kid, lost a lot of weight in college and slowly gained it all back to being 3 bills, I see both sides here. Can I blame society/government for allowing there to be so many hidden calories and downright poison in our food? Sure. Can I blame my parents for ingraining that I HAVE to eat everything on my plate when I was a kid? Maybe. Can I lament that I used to walk and have time to play sports so much more than I do now with my wfh job? Yes.
But ultimately, as a grown man the buck stops with me. If I want to get back down to a good weight (I probably won't ever be sub 200 but I'd be over the moon with 225) I am going to have to stop eating so much and start moving around a lot more. I've already cleaned up my diet considerably with the help of my wife (she is 120 lbs and very health conscious) but I just eat too much. I'm sure my brain has been wired to not feel satiated, but I can just get used to it. I have before. Ultimately my weight is my responsibility.
But I also would never belittle anyone for getting surgery or using medications (though the latter seems like way too much of a gray area to do willy nilly), and I don't think anybody has really done that in this thread. I will deride people who don't even give an effort and say they can't do anything about it, which is the majority of fat people in the US.