I drop usernames without a second thought if it suits me. I use different ones I think up on the fly most of the time. The only one that matters to me is one attached to my development activities in the FOSS community, and I might share opinions using it but primarily I use it to engage in discussion related to development so that people who know me in those circles know who they’re talking to.
While I’d say altruism is not a virtue the way it is defined in our culture, I will say that who we are is about 50% nature and 50% nurture, and inside we are very different beings for one reason or other. A born sociopath is only human the same as you in visible form, the being is nothing like you. A person who was badly abused and tattoos his face and perpetuates abuse on those around him is completely different from you both. A monk in a monestsry and an Instagram influencer are completely different beings inside, besides some basic neurology that makes them both human. If you could see the being inside every human they’d look as different as Pokémon. That’s my philosophical insight.