Those who only think of themselves tend to pull this sort of stunt every time they feel personally affected.
Thus those people might not typically go to protest parties because a pandemic is not typical. That's about it.
> They'd rather take what they consider an indefinite but small risk of dying
That's precisely the narcissist and egotistical attitude that's being criticised.
They feel that as the disease does not affect them personally then they should just not be inconvenienced in any way. But that misses the whole point, doesn't it? The point is not about you. The point is that your wreckless behavior puts everyone around you at risk, including those who covid19 threatens their lives. You might not die of covid19, but if you catch it and pass it to your grandma or some random old man from your neighborhood then they might die. That's why you need to get your add back home and wait.