It is very leftist and Soviet Unionist to declare anyone who doesn’t agree with the party line to be “insane”. Hence the labels of “homophobia”, “islamophobia”, etc., used by the modern left.
That being said, the online ravings and declarations of this individual are seriously outside acceptable societal norms.
Also, the behavior of the jihadist truck bombers and terrorists, are cult-inspired. Cultures vary widely and often violently. The idiots who sing Kim-By-Yah and declare that we are all the same, are self-delusional to nearly the point of insanity. They take an insane position to deal with that which they want to ignore.
Bottom line...there are folks out there whose behavior and/or beliefs are so far outside the boundaries of acceptable civilized (By our society’s accepted moral standards!) behavior, that they need to be disposed of, either by institutionalization, or with extreme prejudice.
Some folks just need killin’!
Screaming mental “mental illness” does not support the narrative needed for more gun control while screaming “evil” brings a lot more meaning.
During the leadership of General Secretary Leonid Brezhnev, psychiatry was used to disable and remove from society political opponents ("dissidents") who openly expressed beliefs that contradicted the official dogma.
Source Wikipedia
Some folks just need Jesus. Well, all do, but some already have Him.