HN-ians like to model stuff, and i get that. To do it properly we need to know how many "young"(active ppl) there are, how many old with lung problems, the rates of propagation in and between those, and probably other stuff. But the goal is to keep the deaths down, and my opinion is that by far the smartest way is to first vaccinate the vulnerable people and those who deal with them directly (nurses, etc.). There's also a lot of points about practicality. For example; If i get infected not much happens (i'd just have to isolate myself, even with heavier symptoms). But if my mother gets those severe symptoms she would need to go to the hospital, if she would live at all.

Even if the math says it's better to vaccinate the young ones first, i'd still argue that it's overall safer to vaccinate the vulnerable ones first.

Where do I sign up?!

Or you could go by demographics. The hardest hit groups in the worst spreading areas. Etc.

You're right that it's not a trivial thing, but if you wanted to do it, reasonable approximations could be found.

If the goal is to slow down the pandemic, then the "irresponsible spreaders" should be vaccinated first.

On the other side, if the goal is to punish "irresponsible spreaders", then they should be vaccinated last. But that also means that pandemics would not be slowed down, and the ones taking that decision will be responsible for further spreading.