Our bodies are, but you're going to have to tell us why it's a great thing. Cold medicines just suppress the symptoms your body would use to deal with it normally, so it can last even longer! Sounds like, if it's a good thing to have a cold, that cold medicine helps.
Our bodies are not perfect, you know? That's why cutting out a mostly useless part of it, the appendix, can actually save someone's life. Our bodies overreact and take bad decisions all the time.