Depending on the type of agency,
I made it very clear that I am referring to individual landlords, not agencies.
My perpective is based on 30+ years as a landlord and my wife being a qualified realtor.
You remain a single person, and your views are not representative of the totality. If you are saying that every landlord out there will follow your exact methodology then you are grossly unrealistic, and if you say not all of them will then you agree with me.
all of them will be made nervous
And you were talking about blanket statement? I'm afraid you can't tell what ALL people will feel about a perfectly debatable stance.
their standard procedures
Agencies and businesses have have standard procedures. When he searches he will meet the the mother renting out her recently married son's apartment, the housewife who's father died and left her a house, or the family man who's just converted his garage into a one bedroom place to help paying the bills. These and many other individuals have no "standard procedures".
and starts lecturing the agent/landlord
Cordially explaining to an individual that you would rather not give your SSN to protect yourself and save time and money then showing them that you've just been screened by the government can only result in a pleasant conversation even if your proposition is not accepted. No reasonable person would take offence or consider it a lecture. Framing it as a combative act against the landlord is quite nonsensical and a sign that you are the one becoming combative. I thought we are after giving the best advice to people, not in some cyber clash of egos.
(it is one of their only "weapons")
Then you know there are other weapons. This makes your entire sentence redundant since you explicitly state that there are alternatives, which is what I've said before.
Adjust the rental location search to those places that will rent to people with no credit history.
Then you are obviously aware that in a country of more than 10 million undocumented immigrants, a vast number of landlords do rent without a "standard procedure" or requiring an SSN. Doesn't fit your previous assertions.
Show credit history (or even the police certs used at the interview) from the old country.
Not all countries have a credit history system, and there will be the language barrier. You were not happy with showing them that the US screens immigrants which should take a few clicks on google, yet you think it's practical to show them a translation they can't even verify of a credit history or a police certificate from another country. Not a very coherent advice, is it?
I've done my best here, so don't take it personally if I no more engage in this back and forth. I'm beginning to think that this might be about saying the last word even if facts and basic logic are the victim, and I don't indulge in this. Have a good one.