But then you can apply same logic when a city or a village vote to not pay taxes there, or have special rules, my opinion is that constitution is a very importa

But then you can apply same logic when a city or a village vote to not pay taxes there, or have special rules, my opinion is that constitution is a very important law and there is a reason that changing it requires the majority to vote(probably differs by country). I understand your point but to get the independence is something extreme in this case it should not be a simple process but something more complex otherwise bypassing the constitution can happen every month.