1 Peter is concerning Gods Elect, not all mankind. 1 Pet 1:1-2
Peter, an apostle of Jesus Christ, to the strangers scattered throughout Pontus, Galatia, Cappadocia, Asia, and Bithynia,
2 Elect according to the foreknowledge of God the Father, through sanctification of the Spirit, unto obedience and sprinkling of the blood of Jesus Christ: Grace unto you, and peace, be multiplied.
So the sprinkling of the Blood, application is to the Elect alone, those chosen in Christ before the world began Eph 1:4