The people that went probably faced the same dilemma and worries.
They chose to go, and they won't be posting what a bad decision they made, they'll be picking the nicer photos and posting those. Doesn't mean they are having the time of their lives; just making the best of the situation and only showing the good stuff.
Personally I think either choice is difficult to make. But I seriously doubt we would have gone anywhere. So many stories of getting it on the plane, local lockdowns when there, isolating when getting back, wearing masks on the beach...not a lot of fun.
Don't base your upset on others photos. Remember in order to feel 'better' about things, you'd need to see lots of people having a horrible time so you made the right decision (IYSWIM) but you wouldn't want that either.
We don't have holidays abroad anyway, and we also don't holiday in the UK either because prices are stupid for something really crappy. Never got the fascination with 'a change of scenery' that is shittier than your own home.
I do feel very sorry for anyone with holidays who were forced to cancel and lose money, forced to reschedule and pay more, or forced to 'go' effectively by the first 2 options.
Crappy crap crap.