The fact by sharing your DNA also means sharing your relatives' DNA is just how nature works. You own your of DNA, it was not given to you under an NDA, so you can share it if you like. But that your ability to have control over your own DNA is limited, doesn't mean that it's OK to sample every citizen. That would be kind of like arguing that murder is fine because everybody is going to die anyway. Even less it means that since this ability or right might not mean anything for practical purposes, any other right over your own body can just be given up as well.
Some travel experiences this week: Upon entering Austria a proof of vaccination, test or recovery had to be presented, and a privately printed paper with a name matching the password was sufficient. The QR code was not verified. Crossed the border to Slovenia twice, no border check at all. Twice the other way, no check first time, second time passports and covid documentation had to be presented, but it was not verified online. Visited a McD in Austria. They demanded to see covid documentation to enter. Very weird, and I can't imagine that would be accepted in my own country. Germany seems even stricter about covid, but no issues since I was just in transit in the airport. Some airlines demand FFP2 type masks, but in practice they fail to enforce it since these are not so common. This appears to be a official regulation in some countries in situations where masks are mandated. When entering Norway the covid checkpoint is like the customs. You either go through green declaring that you're not required to go through testing and your papers are in order, or you go into the test lane. I suppose they might select people for questioning, but since it's difficult for them to know what countries you've been to and what rules then apply, it's based on trust. A mask of some kind is still required at the airport, but this is the only place with any mask requirement in Norway. Masks are required in indoor shops in both Austria and Slovenia, and it seems to be respected (but not so much in hotels). Many don't like to cover the nose, so it seems somewhat pointless. Except from the masks, air travel in Europe is close to normal and the crowds in the airports seemed normal. Some delays which the airlines blamed on the ground crews being too few, so the airport might not yet have ramped up to deal with the increased traffic. And airlines still make frequent changes, the risk of being rebooked is high, since they probably are unable to predict well the number of passengers.