Murder is the unlawful killing, with malice aforethought, of another human, and generally this premeditated state of mind distinguishes murder from other forms of unlawful homicide(such as manslaughter) or murder committed during the commission of another crime (sometimes called felony murder).
Robertson described something slippery, with a negative slope. If you want to explain how his remarks evaluate to a who/what/where/when/why/how instance of anyone taking the life of another, go ahead. I see where someone not in agreement might accuse Robertson of a combination slippery slope & strawman play. Past that, phrases like "homophobic rant" & "leads to murder" are "statement[s] that [are] ludicrous on [their] face, yet [they reveal] what the speaker truly believes".