Oh so basically you've bounded the debate?
Show me a single argument that's not from either an anarchist or an idiot that explains how to run a country with zero taxation (ignore the tiny minority of countries that can run entirely on oil exports or such, we're talking the general case).
Regardless, you have to explain what "lawful" means.
No, I don't. That word is in the dictionary and its definition is in no way disputed.
I don't care [...] Because morally,
So you're asking me to explain "lawful" only to say that it actually doesn't matter?
Other than 400 years ago, we did it with swords and gallows and dungeons and now we've made it a bit cleaner.
You need to get your head out of your ass and into a history book. The rule of law is at least 2000 years old and while governments have always had the option of force, its actual use is comparatively rare. Especially compared to mob rule. Today, 100 or 1000 years ago - you can clearly see that when the government breaks down, violence and crimes increase dramatically.
Morally, the difference between a "noble" passing a law that he can rape your wife on the first night of your marriage and then take your money for the rest of your life, is exactly the same as changing the US constitution to allow the state to tax in like manner.
Firstly, you really need to study history. While ius primae noctis makes for a great legend, historians today are not convinced it ever actually existed, and even if it did there are no confirmed cases of it ever being actually used.
Secondly, you should explain whether you are ok with the general principle of a society or not. In this context, "society" means that a group of people can make rules for themselves and enforce them. The details (nobility, democracy, segregation of powers, etc.) are unimportant as long as you make a covert argument that basically calls anything except pure anarchy immoral. So please come out of hiding behind phrases and state your position clearly. Do you think that people should be able to form societies and enforce their rules on each other or not?
Humans are social animals by nature.
A society can only function if it can enforce its rules.
Laws are basically moral rules written down.
Therefore, I don't see a principal difference between legal and moral arguments.
The difference is that everyone thinks they understand moral, but few people understand law. And yes, not all laws are codified ethics, that's true. Many are of administrative nature, for example.
Is there no room in this world for morals?
Morals differ, even from person to person. That's why a society needs a common set of values.
anyone who found you could just steal, rape, kill at will?
Look around you. What's happening in Syria and Iraq? What's happening in parts of Africa? Yes, my idealistic friend, this is exactly what happens when government breaks down and societies fail. Sure, it is morally wrong, but it happens.
So in fantasy lalaland, where everyone is perfectly moral and also shares the same morals, you don't need governments, taxation and all this shit. In the real world, where real humans with all their mistakes live, you do.
I won't ask you to describe how a world based purely on morals and without government "interference" would work. Greater minds have failed at that task.