Here's my view.

We are losing sight of what actually happened. A male loser, friendless, bitter and unattractive, placed a bomb so as to kill a bunch of little children - 19 of them. (True, others were killed.)

I think that some slayings of children, especially girls, are not founded in perversion, but in jealousy. There's a man, call him L., who is jealous and is convinced that society doesn't afford him the money, respect and status that he deserves.

he's jealous of another guy, call him H, who has a better life. H may not be rich; he may simply have a steady job or a loving family. L, the loser, is afraid to attack H, who is an adult male, alert and capable of defending himself. Instead he attacks H's little girl. And the more he tortures, debases and humiliates her, the more he's "showing" the society which failed to honor him.

McVeigh just did it on a huge scale.   All the government talk, and the federal talk, and the conspiracy blah blah blah is just window dressing.