If he wasn’t gay, where did those lips come from? Only a gay or a woman would have his lips injected to make them blow up like that. If they were natural there was something seriously wrong with that boy’s hormones.
I think he got the lip injections as a backup in case his air bags didn't work.
A while back I saw a documentary on one of the PBS channels hosted by David Suzuki. His theory, which he strongly implied but didn't outright state (for obvious reasons), was that homosexuals are "made" in the womb. According to him, children get their sex determined at conception, but their orientation and their relative masculinity/femininity are determined during gestation. There are specific times during pregnancy when the correct amount of the correct hormones are supposed to bathe the fetus so that it turns out as expected, i.e. a straight masculine male or straight feminine female.
If the mother's body is stressed through anxiety, drugs, smoking, drinking, etc. then a hormonal imbalance can occur at these important times leading to homosexual effeminate males, homosexual masculine males, homosexual effeminate females, or homosexual masculine females. He mentioned a study that there seemed to be a spike of homosexuals born to women who gave birth during WWII. Seemingly these mothers were stressed out about their husbands being in harms way and potentially getting killed.
This would explain the rise of the LGBT movement in the 70's if there was a spike in homosexuals born in the 40's.
The LGBT lobby seems to suppress any discussion of this possibility. If hormonal disturbances during gestation are the real cause for homosexuality, then the cure is relatively easy, i.e. treatments to make sure that the hormonal balance is correct throughout pregnancy.
The killer's mother could have been under a lot of stress while she was married. According to the manifesto, his mother was so upset about what happened in her first marriage that she never wanted to get married again.