I a way every disicision you make is selfish. no matter what disicision you make its all about personal intrest. if you mamke a disicision that bennifits you thats helping your personal intrest. if you make a disicision that bennifits someone else your're helping your own interst because makeing them happy in turn makes you happy. if you make a disicision that bennifits no one (as stupid as it may be) you're happy in a way because you made a disicision. so in a way its impossible to not make a disicision about self intrest.