Is it normal to only do what works for you?

I've known many people who only do what works for them, Rauki (an Aborigine I know) only does what works for him and Peter (not Jimmy, not Jacob, as he calls himself, but Peter Gorey, his legal name), Selwyn only does what works (at an extreme level) for Selwyn, and Peter only does what works for Peter, & I only do what works for me as the Joker on Batman only does what works for the Joker: the only way to live is without rules and tonite you're going to break your own rule! He means break moral rules and to be unethical, implying that it's all that works and that anything else isn't good enough and he's right, by breaking my rules of virtue (which is moral excellence) and even my own food rules, I live better and get along better, therefore I only do what works for me, and people in history have only done what works for them: eliminating one extreme to fix the other (which is what I do almost all the time) Lao Tzu only did what worked for him, and eliminating his bad experiences, including extreme asceticism, and finding the Middle Way, the Buddha only did what worked for him, is any of that normal?