Why did Jahrling rationalize not telling anyone about having sniffed the solution?

Peter was frightened of being placed in the what they called the slammer. He rationalized his decision to say nothing on the fact that nothing had happened to Dalgard, thus, it was very possible nothing would happen to him.

"But think about Dan Dalgard cutting into monkeys. Bending over and breathing

monkey when he opened their abdomens. He was bending over their intestines, over a pool of Marburg blood. So then, why isn't Dalgard dead? Well, he reasoned, nothing's happened to him, so maybe nothing will happen to us."