This world filled with murderous terrorists, pedophiles, violent gangs & drug cartels -- increasingly filled with evil , corruption, violence & murder is evidence that the Lord Jesus is reigning over it and Satan is bound?
You have a wrong understanding about "reigning" .
Jesus is not reigning over the earth to save the earth!! He is reigning to save/seal/preserve people from out of the earth, for when He returns.
.
Born again Christians are now made to be kings and priests unto HIM. In Christ's stead we are His ambassadors, reaching out to others, so that they can be reconciled to God. IOWs, Helping and leading others to Christ as their Sacrifice for sin. That's what priests did, and do!!
.
We are kings by His Holy Spirit within us.
And because the King of kings IS WITHIN US, we are kings unto Him and no one else!
.
Rev. 1[
5] And from Jesus Christ, who is the faithful witness, and the first begotten of the dead, and
the prince of the kings of the earth [those who are begotten by the Holy Spirit].
Unto him that loved us, and washed us from our sins in his own blood,
[
6]
AND hath made [present tense]
us kings and priests unto God and his Father; to him be glory and dominion for ever and ever. Amen.