Interesting that the perpetrator warned people nearby of the bomb, and tried to minimize loss of life.
This is why you could talk me into accepting the 5G theory. He wanted to send some kind of message about "the 5G conspiracy" to, in his twisted way, help, not harm people. The song he chose to play, if you read the lyrics, certainly would explain why he chose to suicide rather do the job and avoid capture. He seemed to be yearning for "A better place".
Though I have to admit that I would like to buy a lot of tinfoil stock, because I could easily sit here and come up with all kinds of conspiracy theories about him perhaps being tricked or coerced into doing his job by "The Man", "The Illuminati", foreign actors, and a host of other things, just because 2020. :)