Every Senator has multiple ways for their constituents to contact them (or their office) and the Constitution itself provides a mechanism for holding them accountable, it's called voting. The idea that they have no right, as public officials, to protect their families from harassment, threats and attacks by violent antifa terrorists is counterproductive. If we're to accept that it's ok to endanger their families whenever we disagree with them, we only discourage good people from wanting to hold an elected office in this country.