I find that for questions like these, it is better to ask “how” than to ask “why”. When you replace “why” with “how”, the questions
Why does anything exist? We observe that everything seems to obey simple mathematical rules. Do these rules become what we observe as reality, and if so, how?
Why does this possibility exist? How is it that we observe only this possibility?
Why do thing have causes? How does causality work?
Why does a certain cause have its particular effect? How does causality work in this particular case?
I find that for questions like these, it is better to ask “how” than to ask “why”. When you replace “why” with “how”, the questions
Why does anything exist? We observe that everything seems to obey simple mathematical rules. Do these rules become what we observe as reality, and if so, how?
Why does this possibility exist? How is it that we observe only this possibility?
Why do thing have causes? How does causality work?
Why does a certain cause have its particular effect? How does causality work in this particular case?