It's very much logical reasoning, and it's not about DNA being scary. It's about a kind of perfidy. It's the reason you in war don't masquerade as someone who

It's very much logical reasoning, and it's not about DNA being scary. It's about a kind of perfidy. It's the reason you in war don't masquerade as someone who is wounded and to try to get at your enemy, and don't use fake medical stuff in ruses, &c (this of course happened once in Pakistan, but I count it as those responsible lacking in understanding and being short-sighted). You don't ever do anything that will in any way affect people's trust in the medical system, even indirectly. This has been understood for a long time, and is part of the reason why the Hippocratic oath (i.e. the actual Hippocratic oath) involves swearing to never do any harm.