Any rational person knows Soleimani was a dangerous person whose orders caused significant instability and death throughout a large swath of Asia (minor and major). Any rational person also knows that that alone does not make his assassination legal. (It also does not make that assassination prudent or effective, but that's a different discussion.) When a senior leader within a nation is murdered by agents of a foreign government without even the decency of declaring war first, of course there will be calls for revenge. I'd expect no different from my fellow Americans if Pence or Esper or Milley had been targeted in a similar way. Heck, I'd expect worse. One cannot conclude that there's an organized propaganda effort until the "natural" level of such sentiment is accounted for.