Not maximizing your own happiness is a fallacy

I call it a fallacy despite it not being a fallacy if happiness isn’t your goal, because I believe it’s irrational for it to not be your goal as you would be acting against your own best interest.

For example, it’s hard to argue someone has your best interest at heart if they advise you to say no to the following:

Suppose that an advanced team of neuroscientists and computer scientists could hook your brain up to a machine that gave you maximal, beyond-orgasmic pleasure for eternity. Then they will blast you and the pleasure machine into deep space at near light-speed so that you could never be interfered with but at the cost of a billion innocent lives. Would you let them do this for you?

Saying no to this choice contradicts the idea of acting in your own self-interest. Hence I call not maximizing your own happiness a fallacy.

Question from HERE

In addition, you should say yes because as soon as you get to that high-state of happiness you are no longer concerned about ethics, regrets, morals and the guilt you feel would disappear and you would be happy that you made that decision to feel that high-level of happiness.

Since the above example is extremely unrealistic, here are some more realistic ones:

  1. When choosing if you should be vegan, you should weigh the reduction in your own happiness from excluding meat from your diet against the happiness derived from not partaking in an unethical activity

  2. You shouldn’t randomly kill someone because the guilt would result in negative happiness, and even if it didn’t the risk of imprisonment would result in negative happiness.