The notion that Americans should dial down their incendiary rhetoric is undeniable, but that message cannot be delivered credibly by the person who literally sent a mob to the US Capitol, and then sat back and cheered the thugs who assaulted cops for three hours.
The plea to ease up on hate speech cannot be made by the guy who invented a patois of political violence, who prods supporters to assault hecklers, threatens to shoot undocumented immigrants and looters, jeers the husband of a rival who was assaulted with a hammer, and refers to opposition as “vermin.”
And the idea that the toxic talk has gone too far sounds hollow coming from a demagogue who thinks Hillary Clinton’s fate might best be settled by “Second Amendment people,” that Liz Cheney should be sent before a military tribunal, and the Chairman of the Joint Chiefs, Mark Milley, should be executed.
This is the political atmosphere that Donald Trump has nurtured, so when he whines about how “the rhetoric of Biden and Harris” has inspired two troubled people (both likely Republicans) to shoot at him with assault rifles, it can be dismissed as one of the most pitiful attempts at gaslighting from a deranged felon who has made a career of it.
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Thus is a holdover from half remembered lessons on Plato I guess. Socrates is contrasted with the rhetoricians as seeking Truth, a noumenal thing beyond us that we discover (or recall as Socrates would put it). The rhetoricians representative Gorgias has his argument famously summed up as “man is the measure of all things”, that is to say that nothing is either good or bad but thinking makes it so.
Rhetoricians famously taught people how to convince others of their point of view, essentially modern debate technique. Socrates undermined this practice by pointing out that the skills employed (tone of voice, rhythm, eloquence) had nothing to do with determining truth.
With this argument in mind we can see why “rhetoric” is now used as a shorthand for emotional appeals, or style over substance. Rhetoric is what you rely on when you cannot make a structured and logical argument, while in theory the truth is the truth even if delivered in a dull monotone of limited vocabulary.