Or what about the foreign and criminal funds funneled into the DNC through ActBlue?

It's deterrence vs catching the criminal.

For example, I mention that every adult must pay a $30 application fee, pass my credit/criminal background, make a combined income of 3x the rent, and whether or not the property accepts pets.

The note investor who believed that missing a note payment was a CRIMINAL offense and wanted the AG to file criminal charges4.

In most places you can deny on credit and criminal history. 

Their character, their payment record, how well they take care of you property, etc all these things are for you to discover with your tenants and build trust between each other. 2. when it comes to screening, you must check their credit, their paystubs, their employer and landlord references, their criminal background, I also get a copy of everyone's photo ID.3.

A month back he asked me to add his brother and his wife to the lease and I asked him that they need to go through criminal and other checks that we went through.

I am currently in the process of filing lawsuits against all of these tenants on behalf of my clients, and I am hoping we can add criminal charges onto the civil suits.

Good Cause Eviction, the 2019 TPA, the history of moratoriums, and the clean slate act sealing criminal records and other offenses. 

Report him to your local licensing boards as well as make police reports, even if not a realtor he will get large fines and potentially criminal charges.