If the constitution and the courts have deemed the ref illegal and any outcome invalid what else do you need to prove that independentist have no legal ground t

If the constitution and the courts have deemed the ref illegal and any outcome invalid what else do you need to prove that independentist have no legal ground to proceed? The war declaration is from the police and who controls them. Catalans may be playing referendum but that's their call. Are you going to shoot the first person who declares independence? The value of freedom of speech is very weak in spain...