I wouldn't make a tattoo, because life may change drastically. What a person tries to portray in those tattoos may not hold true anymore. The same applies to those happy memories which may be spoiled by either a bad memory or another bad circumstance (recall all those "broken love" movies from 70-80s). Or they simply may fade away and you wonder why there're still there.
For men, tattoos may be a symbolism of power, but in most cases it's illusionary. If we also take the pseudo-feminism trends nowadays, women may also choose to make tattoos for similar reasons, to become more like men (rather than being a liberated woman, which I think this is what feminism should be about, it shouldn't be about power per se, which modern media is trying to make us believe, but I'm going slightly off-topic here).
It's like, are we ready to wear a single T-shirt throughout our lifetime with the same image on it (that would be practically the same thing as having a tattoo, except that it's not directly on your body). So, that's a reason why people choose to make tattoos under the wear, so they can hide them from public view, and eventually it becomes intimate. And as they say, being intimate means being vulnerable, yet people avoid being vulnerable most of the time.
That said, there's some degree of dichotomy when it comes to making a tattoo or not, and I think that's again mainly due to social pressure rather than a personal choice.
Of course there are other reasons, but that's something which I feel is relevant today.
