From the articles I read (the articles from reputable news sources as opposed to just conservative sites), these electors are getting letters, emails and phone calls, asking them to exercise their right and duty in this electoral democracy, to refuse to elect someone who is unqualified for the office.
It is from the
AZ Republic (the paper that received death threats for endorsing Hillary).
"Ash declined to share any of the emails but described them: "They demonize me, they call me a homophobic, an isolationist, a bigot, a misogynist, and an anti-Semite, which is interesting because I'm Jewish."
How about
CNN?
You are right, you can call or write to electors, but death threats are not normally part of the deal.
Another bastion of conservatism reporting on a house being vandalized,
The Washington Post? This one probably only made national news because of the swastika.