You are using a line of argument that would justify prohibiting meat, cheese, corn syrup, skydiving, mountain climbing, NASCAR, sailing, tobacco, alcohol, pizza, Coca Cola, desert foods and non-procreational sex. They all risk your life for a momentary personal benefit when someone else might prefer you not and then live longer.
It's also essentially arguing that no one has a right to intentionally end their own life no matter how much they're suffering if their continued existence is beneficial to any third party.
You don't owe the benefits of your continued existence to anybody else, so whether risking your life is bad is a determination you get to make for yourself.
> So we recently changed the rules to make sure that wont work anymore
Naturally. But there are two problems with that.
First, it's not really analogous to seatbelt laws, because if you don't wear a seatbelt then you could die but if you get a virus and spread it to five other people who each spread it to five other people etc. then thousands of people could die.
And second, those people are then in a different country which is making its choice in a different way. They may be wrong, but they're sovereign, and it's the people who live there and intentionally go there who suffer the consequences. What you should do is not let those people come back without being quarantined.