You are going to the country with one or possibly the highest level of infection on the planet, under no effective public health control and ten times the infection level of Portugal (which isn't considered good by European standards), a disease which has killed hundreds of thousands and which is highly contagious. That's the one sentence version. TAP has a health care safeguard in place for that, with accompanying documention check, is that reasonable? Of course it is. I can't speak for Portugal's legal system but if you tried that on in the UK you would risk censure from any judge who looked at the case.