Did you know that the many of God's own messengers warned people of coming judgment. It's something of a theme in both the Old and New Testaments. While I am sympathetic to the idea that there are obnoxious and unnecessarily offensive "fire and brimstone preachers," I am also aware that to make a rule that nobody can tell others of the consequences of sin or the fact of God's judgment is to put a muzzle on the truth.
It's more a question of HOW to go about sharing these things than it is a question of whether or not we are right to share them at all.
My website https://BibleThinker.org