re: Die Hard with a Vengeance questions

The bomb being at the school was coincidence because it was the Chester A. Arthur school (i.e. named after the 21st President).

Zeus got involved first because he didn't want some white guy to get killed in Harlem which would bring more cops there.

Then, because he was pissed off, he mouthed off to Simon and told him to "stick his well-laid plan up his well-laid arse."

Simon's hubris is what helped foil his plan.