This is like saying working out and gyms make the 'ego bigger'. Maybe those who want to 'improve themselves', be fit may already have bigger egos and a self foc

This is like saying working out and gyms make the 'ego bigger'. Maybe those who want to 'improve themselves', be fit may already have bigger egos and a self focus to start with. A study on gym goers would produce identical maybe worse results. Sweeping assumptions on large groups and immeasurable concepts like ego are rarely credible because you will never have the kind of data to justify any blanket claims. This seems more like a 'fetishisation' of the other based on a lack of understanding, and often there is no desire to understand, just label and dismiss. Why would anyone even do a study like this?