I guess the title of the post explains everything. No one is ever born irresponsible. It is inside us, the consciousness to become responsible individual that gain respect from other people. But I guess the consciousness does not live in everyone. Some people make decision for themselves, some people do something for themselves, and most of the time, those people do not realize they hurt and cause pain to their surroundings for being so selfish themselves. Doesn't matter though ! Everyone is selfish, it's just the degree of selfishness that differ. My personal judgment, being selfish is okay, but being irresponsible is not.
We're not living this life by ourselves, we need people around, that is why we have family, relatives, acquaintances, friends, and most importantly life partner. Often for the sake of selfishness, we hurt too many people and worse, not even feel sorry about it. But what's worst? IRRESPONSIBLE. Yes, being irresponsible is far way more disrespectful than being selfish. I hate it when people did something awful and act like it's no big deal. Come on shallow people, can you just stop hurting other's feeling? This world does not fucking revolve around you. So please, just please think twice for every decision you're making.
Okay, what I'm trying to say is sort of twisted and difficult to explain. An example or illustration could do better description. Let's say you're finding a partner to start a business, you got the deal, signed a contract, and every decision in future are made by two of you. You can't simply act like you wish and think your partner will be okay with it, that's absurd. Good thing is, there is a law ! You can always sue your partner for breaching the contract under tort or negligence. Thus for every loss you suffer, you'll be compensated in some way.
However, there is this partnership that does not based on any contract. You both decide to form a strong bond together and that's it ! Just you and me. I could acted like an asshole and there's nothing you can do about it. Dang ! How unfair is that? Right, very unfair. There's no effing law you could use to sue me, nothing. You either deal with it or break up. This is why I wish nothing but responsibility from my partner.