Why can't hashes be decrypted?

Question

Hashing

(For example, sha512, sha256, sha224, etc.)

Answer 1

You can
Question about time and the number of atoms in the Universe
Read at least an article on the wiki for decency

Answer 2

Because it's a checksum.
Approximately for the same reason why it is impossible to find out the value of a byte from the parity bit, but you can only check that all bits came without errors.

Answer 3

Because hashing is not encryption, but the convolution of an arbitrary value to a value from some limited range. Any hash corresponds to an infinite number of possible inputs.