So "enough of us" can take anything by forcing the asset to be valued at an artificially high value, force them to sell it for taxes, and then reduce the price down again to keep it ourselves?
No, it's called rule OF law. Not rule BY law. We create a law, like property rights, and we work within that framework. We don't suddenly decide that property rights don't matter any more because someone happens to have stuff we particularly want to take. That's how dictatorships work.
It would seem quite an essential liberty for a democratic polity to be able to impose this thing called "taxes". I suppose it's up to you to decide whether that is compatible with the rule of law and property rights.