Would they be mad? Sure, a few people may be mad. But let's face it, the Animorphs were trying to free these controllers. The only way they could defeat the Yeerks was by fighting. The Animorphs also had to defend themselves against the many, many, many, many, many, many, many, many, many, many, many, many, many, many, many many many...many human, Hork-Bajir and Taxxon controllers that were attacking them every other book. I think a lot of people would be grateful for what these children did to save them.
It's like in book 23, the Pretender, where Tobias is talking to a recently freed Hork-Bajir. This Hork-Bajir was blind in one eye because Tobias clawed out his eye. Tobias felt bad for it, but the Hork-Bajir told him not to worry, because he was free. And I think that's all a person controlled by a Yeerk could hope for; freedom. Maybe they don't care that they lost an eye, or a finger--in the grand scheme of things, it doesn't matter. Besides, I think the Hork-Bajir were the ones who suffered the most, physically. The Human Controllers mostly shot Dracon beams fromn afar.
As for what you said about the morphing thing, I agree with Phoenix. There's no telling what a person will do once they're given incomprehensible amounts of power. Sure, a few people would use it responsibly, but what's stopping that one person with financial problems? I'm talking about the really desperate people who not only need a lot of money, by have the means of taking it by force--becomming an elephant and trampling through a bank, or stealing bills through cracks in walls in rat morph. The government would be really picky about who they give the morphing power to--but that's not to say that the govenrment (any government) won't abuse the power.
Basically, the Andalites made a huge mistake.
