I do, and occasionally demo it myself because I am a sinner. You just did it with the 'SOLA Fidelists' which prompted my response. I believe in their heart that they know God decides who is saved. The human in them might not be able to comprehend how in the midst of the polluted doctrine that it could be possible. And perhaps in their zeal for the Truth of God they overreact. We are supposed to be zealous for the Truth, God's Word is Truth.
And my remark isn’t supposed to be a prediction that they’re condemned to doom either. It’s more a caution that they should watch how they look. Pure sola fide’ism, actually lived out, would enable a radically trans-denominational acknowledgment of Christ. Being unable to understand how God can do a thing, and accepting that God can do it, is not mutually exclusive. The bible doesn’t require us to believe that entire church congregations are saved Christians either.