International law is irrelevant when it comes to people's perception of truth.

So the only truth is people's perception of truth?

Yes. As humans are inherently ideological and subjective beings, that is all we will ever have.

So killing you is not an inherently immoral act and should be justified under someone's ideological standpoint?

The morality of killing, as everything else, is a question of ideology.

See https://en.wikipedia.org/wiki/Soldiers_are_murderers for a famous debate on this subject.

So the answer is yes.

Correct. There is no objectivity.