"Their actions are compelling me and others to immediately get ready to defend our families, our personal lives, and our properties if violence erupts in America over the impeachment and ouster of President Trump."
If violence erupts over the impeachment and conviction of Trump, it will most likely come from Trump supporters and the right. It doesn't make sense that anyone on the left would instigate violence against those on the right in this case.
If violence erupts over the acquittal of Trump, it will most likely again come from the right. People on the left might be driven to peaceful protest, but those on the right -- especially Trump supporters -- will feel embolden by Trump's acquittal, and therefore more apt to react to leftist peaceful protestors with violence.