There is no logic to any of this.
You could just as easily be on holiday in the UK and that area has a spike and gets lockdown.
Either people should have travelled in good faith and according to the rules or they shouldn't be able to travel, which is the case now.
I wouldn't go now, but I would have gone if I had a holiday booked departing after the relaxation of the rules.
I would also self-isolate, but in my position, that is easy to say.
For others, who have had the goalposts moved whilst away and who might be miles from the areas in Spain most affected, it might be a more difficult decision.
If it is too soon then impose a blanket travel ban so that people know where they are.
I think those saying they knew the risks are missing the point that the powers that be actively wanted the travel industry opened up again and encouraged people to buy holidays or go on those already booked.
They can't have it all ways.