Unquestionably no
One of the defining characteristics of our people is Rachamanim and Gomlei Chasadim. When new frum practicing people move to your neighborhood it is wholly appropriate to welcome them, and goes against everything Jewsih to shun them since “wed don’t know you”
This story is very very rare, (and frankly missing many details) .
the “serious” breaches of halacha are minor and easily remedied . Big deal people who used him for pidyon haben should do another one, How many mezuzas did this guty write alread replace them (and at any rate unlike welcoming ot a community when purchasing STAM it IS appropriate to look into the sofer). Your worried about his dead wife?
Big deal, worry far more about pushing away people , that is a far greater problem.
It isnt even close