You make good points but none that I was disputing in my original post.
Sure there were (and continue to be) a bunch pissed off, maltreated Ambrosi customers. I'm not pretending that isn't the case.
My basic premise is that similar stories (perhaps based on different grudges or forms of mistreatment) exist with just about every small traveling tailor (and many of the big houses, for that matter) that I can name.
Doesn't make what Salvatore did right, but IMHO it's not...