Well the point is that meat may be contaminated in the living animal. The bacteria comes from the animal itself, not necessarily from leaving it out on the countertop overnight.
falcon, I doubt you’re gonna get terribly sick. Like the good folks at the CDC said, unless you’re preggers, have full-blown AIDS, got a liver transplant in the past week or are over the age of 90, your immune system is probably more than capable of dealing with any bacteria which may or may not have been in the meat.
The thing with food-borne illness is that it happens a lot and people often don’t know it. It can manifest itself as a day ot two of mild stomach pains.
You could be real safe and autoclave all your pastrami prior to ingesting it. You might want to pile on the mustard though.
As for your Amazing Technicolor Roast Beef, falcon, I have no idea. It could be mold or bacteria. Maybe the fat in the turkey caused a cool prismatic effect like the oil spots in a puddle. But I’d autoclave that too.