An incel killed 10 people yesterday. A SovCit killed 4 people a few days ago. A neo-Nazi killed a counter-protester in August. A white supremacist killed 17 students in a school in Florida two months ago. Antifa has still killed zero people.
Not really. 'Incel' is being used not because the perpetrator couldn't get laid, but because he (allegedly?) identified with and participated in Incel groups who actively make it part of their identity.