That's how it came down, practically and especially emotionally, to a lot of people who were quarantined. Seems pretty existential to me.
Except of course the culture and language you’re born into, the public education and legal systems that curb and define your behavior, popular gender and sexual mores...
Modern humanity is a massively socially-constructed and mediated entity, defined by these interactions in their present and historic forms. Existentialism is largely a retreat from this reality into the fictive notion of an individuality because it shields one from engaging with the larger terrain, within and without oneself.
Humans’ evolutionary advantage over other species is our capacity for imitation, which allows for us to transfer skills and abilities outside of and beyond what is inherited through biological descent. But what this also means is that we’re constantly running these imitative, collective structures within ourselves at all times, seeking more and to share our own permutations of them. The reason people go insane in isolation is not because they’re confronted with they’re “freedom,” but because they’re more disconnected from this networked collectivity from which our notion of “self” is constituted.
That depends a lot on what you think you are. As far as hyper-individualistic egocentrism is internalized, indeed you are an insular, isolated entity hopelessly alone in your existence. If you throw a dash of blank-slatist postmodernism on it, indeed you are whatever you define to be and gosh it is so hard to choose what to be and you might as well be nothing.
If you see yourself as the continuation of past generations with a purpose to leave something for future generations, while doing your share for your current fellow humans, in short, if you matter to other people, then your life has meaning and you are as connected as one can ever be. If you see the struggle of your ancestors on these same problems, and the gifts they have left for you including the genes, epigenetic methilations and memes (i.e. everything from science to culture to music), if you see yourself as the fallible human being with the curse of having infinite potential (because we are the best generalist species but can only be so many things and achieve so much in our lives) therefore making sure to raise and leave something valuable for your following generations (doesn’t even have to be own kids), suddenly your choices are not as high stakes and you just have to do your best with what you got.
Both definitiions straddle the same existential problems, isolation, meaning, choice/responsibility and death. One gets crushed under them, the other thrives with the challenge they provide.
Uh.... this completely misunderstands like literally everything Sartre wrote, the point of which was that you ALWAYS have a choice.