That still doesn't explain what your claim that "schools are too oppressive, demeaning, and dictatorial" have to do with him shooting up a school (that he wasn't attending).
That still doesn't explain what your claim that "schools are too oppressive, demeaning, and dictatorial" have to do with him shooting up a school (that he wasn't attending).
I can only guess as to what specifically motivated the school shooting, however, I personally do find schools to be oppressive, demeaning, and dictatorial, so that came to mind.
I know that some who go to schools that I did not attend, have vastly higher incomes that are not necessarily warranted by their level of skill or intelligence.
So there is also that sense of injustice, that might actually be better described as envy?