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1) People didn't talk about other diseases because none of those you mentioned were resposible for a pandemic, which means that they were easier to control their spread. Of course the diseases themselves are deadlier but that's not the point, they didn't spread as fast and didn't exist in many countries.
2) When did I say other diseases weren't important? They are, but at the moment corona is killing people in the entire world, and I think that's enough reason to care about it.
3) Even if they are just as important, how does change anything? Wouldn't that be just another reason to treat Corona as a serious disease? Or would you want another virus to violently spread around the wolrd without wanting to contain it, just because other diseases are killing people as well? How does that make any sense?
4) And I still don't know how you manage to treat this thing as ''common'' thing. You can never be too careful, you're mother has definitely said that to you. Or you don't have a mother, that would explain a lot.