But, the fact that I have a problem with this relativization of everything does not mean I think problems people do not consider "the most disgusting" should not be tackled.
Look at my country for example. Corruption in local government affects me more that what is going on in China. I can also fight it more that what is going on in China. And, in the end, I care about it more in the "daily on my mind" sense of the word. That does not mean I should label it as being objectively worse or "most disgusting ever".