I guess because emotions,well most of them,hurt. I know how it feels. I wanted a few times to get rid of them,but with out them-you're shallow,you're not a soul,a human,you're just a hollow shell of something there was...It's a part of life,but it's not about getting rid of emotions,it's about embracing them.
I wouldn't be able to cast any spell if I didn't have my awesome emotions (maybe one that took forever to manifest, everyone's different, I know). It's a double edge sword.
Plus, from a biopsychological perspective, getting rid of even a single emotion would disable some decision making ability. This is because operating with the logical brain alone will allow you to consider options, but ultimately it is the emotional part of the brain that settles on an answer; the logical brain will not settle on an answer. I'm not sure why I'm ranting.
Embrace emotions in order to figure out YOUR best ways to deal with them, allow them to strengthen rather than burden.