...never use the word "should" in political discussions, unless you mean that, if you don't, government should do something about it.
Because that is what everybody understands you to mean.
One of many reasons libertarians regard concepts like "People should reduce the amount of vitriol in political discussions, the violent rhetoric leads to violent actions" as deeply suspicious, and the party treated as offending this sensibility - be it the Democrats or the Republicans at the time - reacts so heavily against the sentiment.
"Should" is a loaded word. Fire it only with great discretion.