The point of extra-curricular high school debate is there is a topic and there are norms that we are here to discuss the topic. The argument about creativity is a good one - the point is that if someone starts talking about how "capitalism is terrible" then you can make that argument. 'They should lose because they are not talking about the topic which means we lose out on that creative structure. I have to take some ridiculous side like "racism is good" if I want to oppose them. It's bad for the structure of debate, etc. etc.' You can make and win on those arguments in-round.

I'm very familiar with high school debate and happy to discuss in detail.