Where your'e wrong is two places:
1. All these concepts you speak of (private property, democracy) are just aspirations which are only effective if they can be enforced by direct force or by established and successfully maintained social structure and mechanisms of social pressure to conform to rules and norms. There is no "God-given" anything (such as "right to private property), because it is a given that there is no God (except, again, as a socially constructed collectively maintained concept: a meme if you will). So your word "sacrosanct" here, again, is just a wish, or a word used to invoke fear that there will be social consequences for violating it.
2. There is no fundamentally important dichotomy between the private and the collective, so long as the collective is acting to some degree as a super-organism, which most if not all collectives with surprising longevity must be doing. Again, individuals versus organized groups of individuals are more alike (in how they interact with their own parts and with their environment) than they are fundamentally different.
What we have is a continuum of self-interested environment-sensing and acting agents, from our individual cells and organs, to us as "individual" humans, through tightknit resource-sharing, inter-supportive family groups, to corporations and associations, to various levels of governed groups like cities, states, nations, and federations. All can "claim to have and act as if they have" private property:
- cell 1 to cell 2: this is my blood sugar, I'm taking it inside, you can't have it
- person1 to person 2 or to nation 3: This is my house and possessions with walls and doors and you can't have it or live in it:
oh and this is my gun and I'm gripping it tightly and pointing it at you and you can't have it, or the other stuff I mentioned.
- nation 1 to nation 2: this is my fertile valley near an ocean port. I'm invading it and building a wall and an army around it, and you can't have it.
- nation 1 to person 2: Get over yourself. If I want your stuff I will incarcerate you or eliminate you, and take your stuff.