That is really quite profound and you have hit the nail on the head. So the question should be not just about the tattoos, but how we all devote ourselves to unsuitable realtionships, with unsuitable people. Chucking ourselves in at the deep end. I think having children without thinking and to whoever is the done thing now and is completely acceptable - and is an indictment of the society we have become.
I think I prefer to think that when we enter into a relationship and have a family with someone, it is a triumph of hope over experience. The tattoo thing is experience over hope perhaps. Every relationship will end. If we're lucky, the end will come after a long and happy life together. Otherwise, it's the divorce courts. As to which is the more painful/destructive I can't say as my experience is limited to only one field.
So what does this thread show everyone about relationships and people who have tattoos - hmm interesting...
It shows that all sorts of peeps have tatts and all sorts of peeps have relationships. To assume anything other from the information given is somewhat judgemental, IMO.