The Erev Rav is the cause of all wrongs in the world. Their souls are a mix of Good and Bad and it gives them power to draw light but for selfish reasons. Their greed and desire to control drives them to be powerful politicians, bankers and heads of all kinds of organizations including religious organizations where they can also bend the soul of the people to serve their own agenda.
The Zohar in Naso #104 reveals that at the time before Mashiach the Erev Rav will be rich, live in peace and without sorrow. They are greedy, judges that take bribe and leaders of the people as it said in Lementation 1:5
“הָיוּ צָרֶיהָ לְרֹאשׁ אֹיְבֶיהָ שָׁלוּ”
“Her adversaries are become the head, her enemies are at ease;”
“יְהוָה אֱלֹהֵינוּ, בְּעָלוּנוּ אֲדֹנִים זוּלָתֶךָ; לְבַד-בְּךָ, נַזְכִּיר שְׁמֶךָ”
“YHVH our God, other lords beside you have had dominion over us; but by You only do we make mention of your name”
This verse tells about the situation when the good people are dominated by others from the negative side, like the Erev Rav and people influenced by the other side. Negativity is temporary in this world as God promised to remove the evil spirit from the earth.
God offers us the cure, the way to be saved from the negative people that seek TEMPORARY state of life with no future.
“וְעָשׂוּ לִי, מִקְדָּשׁ; וְשָׁכַנְתִּי, בְּתוֹכָם”
“And let them make Me a sanctuary, that I may dwell in them.”
When we build a vessel for the Light he will come and dwell inside of us. This is the ONLY option for those who wish to achieve immortality in this life or merit the resurrection. Having a Holy sanctuary inside of us is a ticket to the Final Redemption and bright future full of Light.