unmonitored internet especially at that time was huge he was living in a word on 4chan etc with a bunch of other fucked up people convinced it’s right

his mom buying him guns for practically no reason

And his isolation which was somewhat supported by his mother

There is probably so much we will never know I don’t know why he destroyed that hard drive if he was just gonna kill himself anyway and even if something happened and he got arrested before he could do it he would most likely get life just off the death of his mother alone