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Not really.
From the native Americans to Afghanistan, Libya and Syria, the US (and Western Europe and USSR for that matter) did war, genocide, discrimination, segregation, slavery, and so on, very well, on a huge scale, without trolls.
Trolls are absolutely insignificant in causing "war, discrimination, dictatorship, genocide".
If anything, our "troll heavy" days are much better in all of the above terms.
And if you mean the infamous "Kremlin trolls", those are just the fad of the day, to point them blame on someone. The US had and will again do its thing in the middle east for oil, regardless of what some Facebook troll says. And they'll compete and go to trade war with China for their private interests, regardless of what Twitter says.