Earlier quoted context omitted.
Can a country be called democratic if me and six friends are not allowed to draw a random border around a house and then vote to murder the residents with only our votes counting because only those inside the arbitrary border we drew are allowed to vote?
Unless the residents you vote to murder are also given the same freedom to secede and draw a border that excludes you because they do not consider your rule legitimate, this certainly would not be democratic. Your analogy illustrates why a right to secede matters: It is the ultimate peaceful (if the right is protected) tool for those who feel disenfranchised, whether by being robbed off the chance to vote or because…
And to the rest of the planet is totally legit
Deploying police when there are serious disturbs by groups of organised people that are purposely preventing people from leading a normal life, ravaging and creating really dangerous situations for everybody is: NORMAL.
Name a country in the planet. Whichever country. This is exactly what the government of that country will do in the same situation.
Maybe for a few people is a videogame and lots of fun, but for the rest of us is a rock put in the path of the train when we or our loved ones are travelling. You will eat this rock if I would see you doing that.
For the rest is their small shop set in flames or ravaged. Is huge bills in damages and healthcare that they will have to pay. Is, undoubtely and crystal clear, Terrorism.
And deliberately sending your minions to disturb the peace and convivence of the society, unless you agree to "talk with me" accept my new twisted concept of "democracy" and gave me something for telling my people to stop and go home. Well, this has a name also in any part of this planet and the name is blackmail.