> Technically, the state confiscating wealth derived from your labor through taxes is a form of robbery and slavery.

Without the state, you wouldn't have wealth. Heck there wouldn't even be the very concept of property, only what you could personally protect by force! Not to mention other more prosaic aspects: if you own a company, the state maintains the roads that your products ship through, the schools that educate your workers, the cities and towns that house your customers... In other words the tax is not "money that is yours and that the evil state steals from you", but simply "fair money for services rendered".

To a large extent, yes. That's why the arrangement is so precarious, it is necessary in many regards, but a totalitarian regime or dictatorship can use this arrangement in a nefarious manner and tip the scale toward public resentment. Balancing things to avoid the revolutionary mob is crucial. Trading your labor for protection is sensible, but if the exchange becomes exorbitant, then it becomes a source of revolt.