I mean you have to ask what does unreasonable mean in this context?
Because in a literal meaning, that basically puts both John Carmack and Adolf Hitler in the same "unreasonable men" bucket. Both had ideas for the "world" and adapted it to themselves.
But I don't think we should read it that way. Also you should never take one philosopher's idea and only follow it in isolation. Every great thinker has massive blind spots and it's always better to think for yourself and read opinions that may counter each other.
Also I don't think its as simple as to be happy you must accept the world and be a passive host and make no changes. In fact, many would argue you get real happiness when you pursue something bigger than yourself and in those pursuits, we usually make progress.
More so, do you think Hitler was unhappy? Are you saying every unreasonable person that makes progress is unhappy? That clearly cannot be true.
In fact, your question should be answered by what is happiness rather than how to be happy. And the answer can be complciated. No 10 list guide can truly help you unravel the actual human pysche and what makes you you but it can act as markers and make you think if done properly.
> More so, do you think Hitler was unhappy?
Yes, he killed himself in the end. If the question is whether he was always unhappy, well, I'm sure there were happy points in his life.
Negative happiness. For Hitler, being captured alive and utterly humiliated in front of the world's jury as it were, must have been a prospect too horrible to contemplate. Happiness with a coefficient of -10 as against maybe -5 immediately prior to death by poison + gunshot. His and probably everybody else's choice and as in his case, something for dictators to ponder.