You're not displaying "ignorance," despite the learned lecture. There are some similarities and some questionable words the killer displayed and used. As far as language... he used the debated term "Ismail Ax," whatever that signifies, he also has railed against "Christians" and "debauchery" (an Islamic favorite).
The video is much like a Jihadist would construct (although a lot more sophistcated in technology), the hate and venom spewed against "rich kids" and "Christians" is not unsimilar.
I would also contend that Islamists ARE in fact "nutjobs." Islam is a cult and, once indoctrinated, cultists are by my definition "nutjobs."
Agree, it was very similar, especially when he spoke of us screwing his "brothers and sisters". And I also agree, people that blow themselves up along with non-combatants and innocents, are consumed with crazy thoughts, fueled by murderous hate. Just like Cho.