"Are there any scientists out there who can answer these questions?"

In so far as they try, they are not BEING scientists. Everyone can wear multiple hats, and everyone can have an opinion on moral & religious matters.

The point is that in matters moral & religious, NO ONE can prove any particular idea, so no one should claim any ultimate answers.

This does NOT mean that the legal system cannot attempt to define certain behaviors as detrimental to society. This does not always clarify 'morality', but only what happens when laws are broken.

Yep...it DOES get awkward when folks try to slip personal ideas of morality in as legal principles and affect private considerations.