Conservatives generally view leftists as human beings surrendered to a corrupt and evil ideology.
The left views conservatives – Christians, Jews and anyone that disagrees with them – as evil. Not misguided, brainwashed, or in error, but literally EVIL.
The conservative view allows for discussion, debate, and redemption.
The liberal view demands the eradication of conservatives.
Until the left – liberals, democrats and SJWs – are willing to acknowledge the humanity of those with whom they disagree, the violence will continue to escalate.