Another key aspect you need to consider is that (pseudoscience/hand-waving incoming) your brain is very good at taking all of your prior experience and extrapolating it forward, and telling you "if you do this thing, this will be the outcome".

My point is, you're not considering all of the things you don't know, because you can't. It isn't just about "start a company that will probably fail based on the % of companies that actually succeed". It's about "who will I meet while trying to start the company, that could turn into a life long friend", or "what skills do I know so little about that I'll be required to exercise while starting my company that may blossom into a passion I never knew about", or "what sort of example could I be setting for my kids/family/friends who might be on the fence in regards to taking their own leaps of faith"?

We're all too quick to assume we know the outcome of things, and we too easily forget the crazy, spontaneous circumstances of our youth that grew out into huge parts of our lives; that possibility doesn't go away when you're older, it's just most people tend to stop letting their lives have any risk or slack in them that could introduce those sorts of catalyst events.