Property is not theft.

I mix my labor with the land, build my house, make my garden, make goods. Even animals claim their territory.
Try sleeping in the cave of a bear :)
How is living life freely theft?

Taxation on the other hand is theft.
What is theft, if not the coercive transaction of property?

But I want to extend a hand to you libertarian socialist ( even though that term always makes me think of a vegan butchers):

Unused land, in my view, can be claimed by someone actually using it.

This is a difficult problem, no doubt, but it can be solved.

Taxation and other violent redistribution, on the other hand, can never be turned into something good.

If the tree is rotten, so will be the fruit.

Without universal ethics there will be totalitarianism.