How Much Do You Have to Hate Someone not to Proselytize?

I’m reading The Trellis and the Vine.  In it the authors, Colin Marshall and Tony Payne state, “The Christian without a missionary heart is an anomaly” (p. 52).  They continue in the same vein,

We have to conclude that a Christian with no passion for the lost is in serious need of self-examination and repentance.  Even the atheists have worked this out.  Penn Jillette is an avowed and vocal atheist, and one-half of the famous comic-illusionist act Penn and Teller.  He was evangelized by a polite and impressive man, and had this to say about the experience: 

I’ve always said, you know, that I don’t respect people who don’t proselytize.  I don’t respect that at all.  If you believe that there’s a heaven and hell, and people could be going to hell, or not getting eternal life or whatever, and you think that, well, it’s not really worth telling them because it would make it socially awkward . . . How much do you have to hate somebody to not proselytize?  How much do you have to hate somebody to believe that everlasting life is possible and not tell them that?  I mean, if I believed beyond a shadow of a doubt that a truck was coming at you, and you didn’t believe it, and that truck was bearing down on you, there is a certain point where I tackle you.  And this is more important than that . . . (Marshall and Payne, The Trellis and the Vine, 52-3).

You can watch the video clip below.  As Christians, I hope we love people enough to share the good news with them and don’t hate them enough to not warn them about their destiny apart from Christ.