What natural side? Where do you ultimately get the right to ownership from if not purely from your ability to fight for your claim to ownership?

It just doesn't exist "out there"

Some arbitrary atrocities were made legal at some points in history. Were they morally more acceptable after that?

No. But society functioned better after we agreed to personal ownership. To maintain that though there is a price, that price is taxes.

If you want to not pay taxes you either must take the punishment, fight to become the defining power of said society or move to somewhere you don't have to pay taxes.