Sure, there's courts and laws, but they pick the judges and can choose to change the laws. They could pass a constitutional amendment tomorrow giving themselves the right to harvest your kidneys, the same way local counties can pass a law at any time raising your property taxes.
And, even if you argue that you have rights under the current government, empires don't last forever. 300 years from now, who's to say barbarians won't be ransacking the house you left to your kids? In that sense, your rights are only contingent on the barbarians being too scared to attack, and not absolute.
So if your argument is, "You can't own a house because the government could take it away", it seems like you have no hope and no possible policy change would give you any "true rights" to anything.
While you have governments that can legally steal everything from you just because they can, you'll never really be free.
That said, there are degrees of freedom.
Property taxes in the US are very high so I consider it an inferior degree of freedom compared to owning a house in a country where I don't have property taxes. The more corporation / income tax I have to pay the less free I am, hence why I'll move to a country which charge less corporation / income tax.
Sure, I'm still owned by the government because they have soldiers and guns and I have none - but at least I can live my life as close as possible to how I'd like to live it.
It is possible to fix this situation once and for all: abolish the government and its idea of legitimacy, let people organise their own defence from the goons of other countries by paying voluntarily.
You won't end up with a much different system, you'll still have some people not paying anything and some people paying more to defend their community - but at least I would pay voluntarily what's needed for my defence without enriching the politicians, fake intermediaries with empty promises, and it wouldn't be coerced out of me under threat of fines and imprisonment.
But ultimately your negative outlook on the human condition is your own, 99% of daily life proceeds under conditions of total anarchy, authority and security are entirely illusory and we pay incredible costs to maintain those illusions, not in terms of liberty alone, but in toil and life itself. It leaves little left to live for, read the Death of Ivan Illyich if you want a better understanding of what I mean.
Those costs are totally worth it. I'd rather live in a nation with liberal democracy and property laws, than whatever more "pure" or original model you seem to have in mind.
In any case, what I'm talking about is democratic and does not forego property rights, in fact it could give you stronger property rights. But you didn't read the grandparent.
How much do you really own?