"a future tyrant who will commit more atrocities than all of the terrorists combined."
The atomic detonations over Hiroshima and Nagasaki happened almost 70 years ago.
Did anyone count how many non-combatants were bombed and napalmed and otherwise killed in S.E. Asia in the 60s and 70s?
How many civilians have so far been killed by conventional warfare and by drone strikes in Afghanistan and Pakistan?
How about counting the number of birth defects caused by depleted uranium weapons in Iraq?
What about all the people who were tortured and kidnapped or "disappeared" by US sponsored forces in south and central America in the 70s and 80s?
I haven't done the maths but I find it incredibly difficult to believe that the numbers of casualties caused by anti US terrorism even looks like a pinprick next to the hundreds of thousands or even millions of non-combatants killed by the US in the modern era, and I am really confident that still holds true even if one completely disregards the use of atomic weapons over Japan.
I don't think one can fairly describe any particular modern US president as a tyrant because domestically they have all been subject to elections and held more or less accoutable (or can be), but the behaviour of the US in relation to other nations has often been tyrannical and brutal. If Caesar came back today he could easily understand various US campaigns in his own terms, including such noble qualities as self aggrandisement, greed, cruelty, curiosity untroubled by ethics, and good old vengeance.