(I agree with the non-exploders. Sort of. Challenger didn't explode, but it's fuel tank might've).
Not even might have, the LH2 tank dome (the bottom end of the tank) dropped away before the short flash (which was partial combustion) and that not because of internal overpressure (which would be explosion), actually the tank suffered from low pressure already because of the leak in it's side.
If the Shuttle did not disintegrate that quickly from that point on, the crew would have opened the third LH2 pressurization valve, an emergency measure to keep the engines running as long as possible, before the low pressure pumps cavitate.
Possibly Challenger might have reached RTLS or TAL, if the leak in the SRB joint would have been in just a slightly different location.
And no, no diplomatic service for me. I would have problems, not going postal at the Hamas, then have problems to stop it and go on in Israel and finally march over west bank, Syria and Iran to Afghanistan. At least in China I would have to stop.
I leave the diplomacy better to people who can agree that it is maybe not an explosion, but explosion-like enough to find a compromise that it maybe exploded just a little and it was good to talk about it.