I think youre being too dramatic and it is more logical than that.

It is less likely for Putin's soldiers to be willing to walk up to a newborn and inject it with poison than it is to drop a bomb on it from a safe distance. First instance is nazi shit, second instance is most likepy just cowardly order following not considering collateral damage - victims.

The more concise and premediated (lets say - conscious) the murder the more severe evil involved. I'd be equally horrified of any war crimes that compare to Lucy Letby in their intention and execution style, but yes - probably more if it is children - that ALWAYS.