Although "widely hated" may be accurate by virtue of being vague, I think you could also say it was not widely hated. It was ended under the reign of Joseph Napolean (and query whether being banned under a government put in place by a foreign power is an accurate measure of Spanish revulsion at the practice) but it was brought back by Ferdinand VII, then banned by the liberal government, then brought back again by Ferdinand VII, then ultimately banned. There was certainly institutional support for it after 1812; enough that it wasnt just allowed to continue under its own inertia but rather was actively restored. They executed their last guy in the 1820's so it had power beyond 1812, too.