As long as those things don’t affect us trivial thing is still arguable. Lets say,most people in Africa are threaten by famine outbreak,it’s a serious problem but it won’t affect the debate/argumentation about the best perfume brand in US.
Every issue has its own place,and not every issue are related one and another. There are many problem to discuss in this world,each people all around the world have their own specific problem,regardless of the seriousness of the problem.
And beside,no one want to bother to think/discuss about something that has nothing to do/won’t have actual affect on themselves.