It's the Jews, but it's probably best to avoid the topic in most circumstances.
Think about it:
Which group had their one and only temple destroyed, their one and only city destroyed, had all of the towns in their country destroyed, and had their population dispersed to all places but their country for nearly 2,000 years, and now that group is at the very top of nearly all important institutions: currency, finance, government, bureaucracy, academia, media, intelligence agencies…etc.
Who is at the seat of power while gentiles are being enslaved?
Who would hold such a grudge?
Who has the power of media and the institutions to unleash a bioweapon which the population eagerly accepts?
Did you bother to examine the Holocaust as closely as you did 9/11?
Who might envision themselves as Hannibal at the gates of Rome?
But largely, this topic should be avoided here.