As to what made him that way, isolation and ideology go together irresistibly well. A lonely person can find a sympathetic group and believe as a result that the Chads and Staceys are to blame for their unhappiness.
Intrasexual competition and being Incel are not necessarily one and the same. Hatred of women and endless cosseting of rejection is not going to work well on the dating scene. Probably he couldn't get a gf because he was capable of something like this, rather than the reverse.
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That was my first thought. It almost does not matter the radical group. Could have been white supremacy or ISIS instead. Lonely people wanting to belong to something bigger and feeling isolated by their environment. Being incel is the symptom, not the disease is my best guess.
End of conversation
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