"Pacifist" Bernie supported the 1999 invasion of Serbia. Thousands of innocent people died here in that American "humanitarian" intervention that allegedly was carried out to prevent war crimes, whilst there were just skirmishes and isolated border incidents.
The result is the semi-independent state of Kosovo, where actual war criminals are ruling, and even the today's Western countries have issues with Kosovar criminal government which refuses foundation of a court for their war crimes. It is a total mess. This is what many pacifists and liberals rooted for. I saw explosions daily and saw dead people, victims of the US Democratic Party humanitarian interventionism.