No harm.

We don’t know any PMCs to recommend in the area mentioned, but since selecting the wrong PMC is usually more harmful than selecting a bad tenant, you might want to read our series about “How to Screen a PMC Better than a Tenant”:https://www.biggerpockets.com/member-blogs/3094/91877-how-to-screen-a-pmc-better-than-a-tenant-part-1-services-and-processesWe recommend you get management contracts from several PMCs and compare the services they cover and, more importantly, what they each DO NOT cover.

You have an obligation to prevent any further harm to your tenant, which might mean temporary housing, a complete lead test and depending on the results, professional remediation.Hopefully, your insurance will cover some of the costs, but even if it doesn't, you need to take this very seriously and act as quickly as possible.This link may help: https://www.nolo.com/legal-encyclopedia/lead-discl...

New England is also benefitting from the Covid world of the remote/virtual workplace.

From my perspective, there is no harm in having a license!

So it’s ok for a perspective tenant to expect a landlord/home owner, tonallow a stranger into their house but not ok for a home owner to ask who they are letting inHmmm I think I will risk losing the people who are afraid of being scammed instead of risking bodily harm or allowing someone to case my home so they can come back later and steal the appliances 

There would be no need to take this matter further legally and if so, could cause more undue harm than intended.

You may be actually causing harm.

Creating a false sense that someone posting online is not subject to harm does them an extreme disservice, and will likely get them in legal trouble should the worst case scenario actually come to fruition.I will note that I agreed with some of your more specific recommendations, but I whole heartedly disagree that this person does not need an attorney, or should not venture out to retain one. 

Especially when that person has your high value asset in their possession, tying up cash, or potentially neglecting, or even harming the asset.