My dd had an accident once. It was in Ikea. We had left her in the baby section that is set up so that they care for kids whilst you go shopping. One of the other girls had an accident. We don't know what happened but she sustained quite a bad head injury. Our dd fainted.
We weren't there and neither were the other parents. The staff handled it badly. No tannoy or anything. We returned to see blood all over the floor and our dd being comforted by a stranger. Not a member of staff but a stranger - another parent who had taken it upon themselves to help out whilst the staff ran around.
Now do you think we blamed ourselves? No. Shit happens and we were fortunate that the parent was kind and responsible.
We make decisions concerning our kids every day and sometimes those decisions don't work out. Sometimes those decisions involve risk, like allowing them to go on school residentials in primary school. Would the teachers care as well for your child as you would? Probably not. But you allow them to go anyway because you realise that in the long run it's for the best.
In the long run we all have relationships we need to manage and being a parent is a strain on even the best of relationships. A holiday is not just for children, it's also a chance for you to unwind as parents and re-connect. I've seen many occasions when stressed parents are trying to control an over-tired child and nobody looks happy or looks like they are enjoying themselves. That's not a holiday, that's an endurance test.
We chose to have a meal by ourselves in order to reconnect as a couple. Because we were finding it all very hard. We lacked family support and so were pretty much muddling through as best we could, but we also needed that time to be together, to re-charge our batteries.
In the long-run our relationship benefitted from us both making the decision to spend some time with each other.
I do not regret it for an instance and if the worst had happened I would not blame myself because sometimes shit happens even to the best of us and playing the blame game helps no-one. That is why I refuse to blame the McCanns even though their situation was different and not one I'd be comfortable with. A child was going to be kidnapped that night, if not theirs then someone else's. It was planned.
The risk of a stranger abducting your child though is so rare it's negligable and therefore that does not really compute as much of a risk on my radar.