How are you so certain I wasn't place on Earth for a reason? I was caused, right? Sure, by my parents, but there is a regression to this causality.
If we keep ourselves within the physical domain, experimentally there is the documentation of a beginning to physical causes that we can observe, and an ordering to such causality which demonstrates its continuum in movement to this present position where I am overwhelmingly purposeful, because I am able to reason my ends which are to give people greater limits of happiness - which begins with making efforts at providing security to families so they can form their own purposeful lives.
Unless you are to claim that reasoning, such as mathematically, is a mistake? But how can that be true?