Nelson Tobin actually understood very well why everyone was so wary of using Mandrakes.
It was not only because the cries of mature Mandrakes were incredibly lethal, and a moment of carelessness could kill oneself and everyone nearby. There was another, more important reason: they feared that other Dark wizards would learn how to use them too, then turn Mandrakes against them.
Since the Defence Association had been founded, Albert had taught them practical techniques more than once so they could better protect themselves and calmly deal with Voldemort's lackeys. Yet during their repeated clashes with Dark wizards, many of those techniques had been learned by the enemy and turned back against them.
Yes, if they could use the cries of Mandrakes to quietly kill a whole group of Dark wizards, their enemies could naturally do the same. If the enemy truly wanted to use Mandrakes to kill them afterward, there was no particularly good way to deal with it. They could not wear Earplugs all the time, could they? As for listing Mandrakes as contraband?
Living Mandrakes had long been prohibited goods in Britain. Apart from certain places, they were not allowed to be cultivated at all. But their relative rarity in Britain did not mean they were impossible to find. Even if living Mandrakes truly could not be found, they could be smuggled in from abroad. There was simply no way to stop that.
Most importantly, once they completely defeated Voldemort and won this Wizarding War that had seemed almost impossible to win, the matter of using Mandrake cries to kill hundreds of werewolves in one stroke would certainly not remain secret.
So, Nelson Tobin could actually understand why Albert wanted to kill all those Dark wizards, even if it meant pushing past his own limits. He truly