We are responsible for our kids because society has agreed that we are. Our responsibilities to anyone else are unclear though. Are we there to help the ones close to us, and to a lesser degree our fellow countrymen? Are we supposed to help everyone, especially those in need? Are we responsible for our endeavours and profession? I don't know the answers, but I believe that we should question our responsibilities and make a decision based on morals, instead of common agreement.
In any case, please be responsible for yourself.