Imagine if we devoted a tremendous amount of resources to studying whether being left or right handed increased your chances of transmitting COVID. Then millions of people online start citing scientific papers saying that right handed people spread COVID more often. Then some left handed people attack right handed people (similar to how Asian Americans are being brutalized in public during the pandemic). The point is that choosing to study the differences in certain demographic groups makes a big assumption that it's important to study the groups for whatever reason.