(Hint: it would be more dangerous to get a shot if you’ve already had it than to not, but it won’t make Fauxi & friends any money if you don’t. Gee, I wonder why they don’t advertise that.)
Get off your high horse and do your fucking part. People are dying of Covid19, and a lot of people who survive end up with permanent disabilites, while you engage in mental gymnastics with your hypotheticals!
It's not mental gymnastics to point out the information overload on one side of this issue, which makes absolutely no medical or scientific sense, yet makes a ton of profit "cents".
Given the fact that you've made an absolutist statement about immunity that doesn't track with the studies I've read, I suspect it's sadly the latter.
(Natural immunity may give rise to more mature memory B-cells, which could be better than the memory B-cells you get with vaccination, but the vaccines do provoke your immune system to produce many more antibodies than found in the aftermath of natural infection. So the jury is kinda still out on this.)
The state of the world is obvious from the activity on this forum. If these are supposed to be "intelligent hackers" here, god help the human race.
If we assume that the biggest cause of heart disease is obesity and poor general health-keeping, the solution there is to completely change your lifestyle: new diet, new exercise regimen, etc. While I think people who are at risk should probably do that, that's a much heavier lift than getting a COVID vaccine.
But given that we mostly don't know how to avoid all forms of cancer (aside from things like "don't smoke and you probably won't get lung cancer"), I don't see what point you're trying to make there. I mean, ok, yes, we should all get vaccinated against COVID in order to make it vanishingly unlikely we'll have to take an ICU bed away from a cancer patient (who got cancer through no fault of their own) who might need it.