For one, he wrongly assumed the apartment had already blown up. By the reports the music started playing very loud right at midnight and the door was not locked. He assumed someone from the apartments would have just walked in, in essence destroying much of the evidence inside. Essentially, he took credit for something that never happened.
One problem I have with that theory is that if this guy is so smart why assume someone would walk. He was basically going on some crazy hope that someone from the apartment building would get pissed off that there was loud music, come knock on his front door, come on in and the whole place blows up. If this guy was hell bent on murdering people why not just have a remote control bomb go off..
If he wanted to kill police officers he had his chance when he was waiting by his car for them, he didnt even put up a fight(For obvious reason, he wants to be infamous now, forever connected to this movie) He must have known when the police arrived that his detonation didnt go off as planned
I did not know this. Thank you.