Life is selfish itself. And that meaning is true even when applied to the whole concept of life. It's there to exist. By the means of existence life becomes selfish. As a person of selfish thoughts, it's hard to forget about the self and dedicate to others. Yes it's hard. And I bet that no one can totally exist by the means of others.
But one can chose to be or not to be for others. That's neither politics nor religious. Affirmatively not about being a good guy and be loved. It's hard to dedicate, especially without being benefitted. So living in a world mixed up is harder. One must have to give up himself for other while a part of him wants those others to get fucked off. So it's not an easy living for one which doesn't want to choose. Or just want everything (perhaps).
But when he's compromised with himself to be for another, he'll need to forget himself, for a moment at least. So when he is committed for someone else, he'll need to forget everything of himself...
...including others which he treats as himself.
Should those internal others sue him as a selfish freak?
I know this is bullshit. It's the most straightforward explanation for all this.