The Lord has come to cast fire on the Earth. Everyone has the choice to receive the savior or be the black coal that is consumed in this fire.
2Peter 3:7 but the heavens that now are, and the earth, by the same word have been stored up for fire, being reserved against the day of judgment and destruction of ungodly men.
Telling people of the coming judgement is what it means to be a witness who does not withhold from you the whole counsel of God.
Jude 1:7 Even as Sodom and Gomorrah, and the cities about them, having in like manner with these given themselves over to fornication and gone after strange flesh, are set forth as an example, suffering the punishment of eternal fire.
Sin will be judged. You are not showing people any mercy or love to not tell people this.
Jude 1:20 But ye, beloved, building up yourselves on your most holy faith, praying in the Holy Spirit, 21 keep yourselves in the love of God, looking for the mercy of our Lord Jesus Christ unto eternal life. 22 And on some have mercy, who are in doubt; 23 and some save, snatching them out of the fire; and on some have mercy with fear; hating even the garment spotted by the flesh.
First you build yourselves up in the faith. How? Faith cometh by hearing and hearing by the word of God. If you are not speaking the word of God you are not building anyone up in the faith. With our faith built up we are able to keep ourselves in love and mercy. Telling people not to tell the truth is neither love or mercy.
Then we need to have mercy on some. Who? Those who are in doubt. Strengthen their faith by speaking the word.
"Snatch some from the fire". The world is a condemned building that is on fire. The Pandemic is a fire, the vaccine is gasoline. Warning people is our attempt to snatch them out of this burning building.