You might have taken a safer self distancing holiday but I guarantee that many were not. The current resurgence may not be entirely because of travel but it surely is a factor.
Many would likely say that having people go to work or school might be worth the increase in risks but it's a lot more questionable when it comes to taking holidays abroad or going to the pub.
They went on holiday, had a good time (presumably), didn't catch covid, didn't get 'trapped' and life goes on.
They didn't factor in travel ban's and yet they're more sensible than you? Really?
It sounds to me like the decision to go on holiday was perfectly sensible and you'd make a similar one yourself if it were not for the people shouting 'stay home' blindly at the ether.
On a related note. Me and my wife have our 2nd weekly test today. We have got on a Oxford university research programme. £50 per test each for the first 5 weeks and then one a month for £25 a time for the rest of the year! nice simple little earner! A lady comes to the house with the test (self administered) so no inconvenience either.