I actually understand both sides here. I think the Catalonian government wants what is best for their citizens and that is admirable. And the Spanish government wants unity and democracy as to how it should be, which I also don't see a problem with.
The worst part in my eyes is the fact both parties can't agree to at least talk about it and come to a solution together, instead having to resort to violence and revoking the powers of the Catalonian government, whilst said government was willing to talk with the Spanish government.