You can not just ignore the right of 2M people to self-determination, and that is exactly what Spain has been doing for many years.
https://en.wikipedia.org/wiki/Catalan_independence_referendu...
The "Yes" side won, with 2,044,038 (92.01%) voting for independence and 177,547 (7.99%) voting against, on a turnout of 43.03%
Calls for dialogue and negotiation, which lasted until the very last minute, failed.