> it's a logical fallacy to argue that because we don't do X already, we don't need to do Y because it's similar.
Sure, but it's reasonable to use to ask people who think we should do Y but not X to explain their justification and reasoning.
> The reasons for not doing X (treating obesity as an epidemic and with the same harshness and forcefulness as covid) is that X is an existing, slow moving beast.
> The covid situation is much more urgent. Making forceful vaccination would have immediate effects and begin a recovery of sorts.
I don't accept that as answering, I know they are not exactly 100% identical in every way, but there are enough similarities that I think it is reasonable to ask the question and I don't think I have seen any satisfactory answer other than this kind of thing which just points out where they are different.
Yes, there are some differences. No, just listing differences is not actually a reasoning for why they must be treated differently. I want to know why those differences matter, or at least what the criteria is.
It's much more urgent? How much? What are the numbers? Are you claiming the benefits to social health and the healthcare system from mandating overweight people to lose weight is less than covid, and what are your numbers? Under your criteria, after covid is under better control or endemic would we then move on to weight loss mandates? How about drug tobacco alcohol mandates? Ban extreme sports? Ban driving of cars made before 2011? Cut speed limits in half everywhere? Ban poor people from having babies?
What's the criteria and where does it end? These aren't extreme examples, you're looking to justify forced medical procedures here so I don't think it's even slightly unreasonable to ask for some pretty rigorous parameters and justification for this step. Not just handwaving about urgency (which is of course one of the staple justifications for all atrocities, e.g., Iraq).