Maybe leftism is kind of a death wish.
You nailed it. See, normal people have a strong instinctive desire and inclination to manifest life-affirming tendencies (Agape/Eros) while deviates gravitate to life-destroying, destructive proclivities (Satanism/Thantos).
Consider these definitions
Atheism - The belief that God does not exist.
Agnosticism - The belief that the existence or non-existence of God cannot be proven.
Theistic skeptic - One who believes that God may exist but is waiting for evidence/proof that they can personally accept.
Anti-Theism/Satanism - The belief that Satan is the greater god and that God also exists but that He, particularly as characterized by Christians/Judaism, is unworthy of worship or anything but opposition and hatred.
Do leftists behave more like they believe that God doesn't exist, can't be proven to exist or that God may exist but if he does, they have nothing but hatred and contempt for Him? I'll let you be the judge.
Note how far-leftists often have fetishes for Satanic things (hard drug abuse/decadence, sexual abuse of / defilement of children and innocence in general, sociopathy / crime, sadism, hatred for God and Christians/Jews). Really the far-left mindset is far more closely aligned with ANTI-THEISM not atheism, agnosticism or skepticism. The far-leftist attitude as represented by the most modern policies and actions of the 'Crats these days is hatred of God and things traditionally associated with Him.