During every large societal change of thought we encounter issues such as this. For every philosophical revolution that has occurred through out our history; whether it is an industrial, scientific, steam, electrical, iron, or religious, the reproductions will all be the same violent retorts.
The truth is, like our issues with race, and other cultures, this culture shift has now raised into its near peak of global recognition. The time of full scale change is occurring, and its scarring people; there will always be some who do not wish for change.
Yes there may be death threats, people write death threats all the time, both "sides" of this revolution are responsible.
Some Supporting EvidenceThe truth is nothing in the world is pretty and perfect, these death threats make this issue seem violent and disturbed, for both "sides".
Its the people who make the violence, and the people who raise hell that are responsible for the death threats,
NOT THE PARTY THEY REPRESENT! Call out the person who made the threat, blame them for the over action, jumping to conclusions, or resorting to violent action.