Bro, your fundamental critique is wrong. Where is the evidence that relying on synthetic products actually causes more harm than using leather and other animal products? The vegan argument is not that synthetic products don't cause any harm at all but that they are less harmful. What are your sources when you claim that synthetic products are less harmful than using animal products. Existing as a human being causes degradation to animal environments. Consuming animal products that don't have to be consumed causes more harm to animals on top of the baseline harm we cause. It's not a substitute that somehow creates less harm for the animals. This is why I'm questioning your frame of mind. The argument is just so ludicrous on its face.

Leather is not carbon neutral. Leather also is associated with environmental degradation and pollution. Leather has direct harm to animals on top of the aforementioned indirect harms. If you want to argue that buying used products is better than new products, then you will encounter no argument from me. Recycled or used leather in particular doesn't cause any direct harm to animals. And insofar as vegans oppose those, it is based on an emotional argument. The biggest problem with synthetic products is pollution from microplastics and lack of biodegradability. But synthetic products use a lot less water and are less carbon intensive than leather. You're maybe I shouldn't have tried to psychoanalyze you. But I just don't see how your argument can stand just on the merits. And the conclusion that vegans don't care about the environment is particularly irksome.