Politicians prefer to talk about theoretical threats of violence, not actual threats of violence. This is because it is easier and more expedient to blame your ideological enemies for theoretical violence than to deal with actual violence. The former consists of making speeches and legislative gestures, the latter consists of policing the streets and, believe it or not, correctly filling out paperwork. (Fun fact: had the State Department been correctly screening Visa applications, 9-11 would have never happened.)
It is easier and more expedient to blame Donald Trump for theoretically inciting violence (i.e., his bombast may someday incite people to violence, so he must be stopped) than to deal with the actual violence of Latino activists rioting and beating up Trump supporters. In fact, you can even justify the actual violence by appealing to the theoretical: because Trump might, in theory, someday incite violence, our own acts of violence are justified! Best of both worlds, really.
Theoretical violence is vague. We are not quite sure who the mysterious Trump supporter is who will some day act on Trump’s rhetoric, but we are assured such a people are out there, somewhere, waiting to snap. Actual violence is quite concrete: not only is there a real person out there who committed the crime, but it is generally possible to predict the sort of person who will commit it.
The overwhelming number of violent criminals in America have a few things in common: they are males between the ages of 15 and 25, they are disproportionately poor and black, they have prior convictions, and they live in one of a dozen or so urban neighborhoods scattered across the United States. We don’t usually hear about these crimes in the national news because they affect such a small sliver of the population.
We do see news reports about people outside of this demographic who appear to suddenly snap and commit mass murder, but the reality is that these people are generally already known to police and their communities as being unstable and potentially violent.
Rather than talk about how to effectively police problem neighborhoods and how to handle the insane, politicians create a sense of general dread and insecurity as if anyone, anywhere, can suddenly snap and commit a violent crime because of impersonal forces like ‘hate’ and ‘rhetoric’ or because of inanimate objects like firearms.
Rhetoric about the deep failings of America appeals to our Puritan appreciation for self-loathing while it lets us conveniently scapegoat our ideological enemies, and if you are a politician that is the important thing. Reducing actual crime rates with proactive policing (not to mention filling out the damn paperwork) well, that takes real work.