I can't find the alleged quote on his LinkedIn page as directed by Wikipedia but perhaps it is the one pictured?
If a Republican had said such a thing about Obama they would claim it was merely a prediction (wink wink) and not advocacy and express total outrage that anyone would suggest otherwise.
That would be true in either case. The difference would be the nature of the audiences.
The target audience--people who need encouragement to rest easy because of Trump's nonsense--aren't generally radical right wing or Alt-Right types. The people who take their cues from Republicans who make such predictions (and particularly Alt-Right nuze types who make such predictions) are generally radical right wing and/or Alt-Right types. Those who are prone toward using violence toward a political goal are also generally radical right/Alt-Right types, so those speaking to that audience are far more likely to incite violence. So those who target radical right wing and Alt-Right types as their audience have a greater burden of responsibility for doing so, just as someone who chose to speak to depressed and potentially suicidal people would take on a greater responsibility to be conscious about the inclinations of their audience.