There is one though: when you're throwing it as part of an organisation which has the official monopoly on violence - the police - in the context of controlling others who are violating that monopoly. Police are allowed to use violent means to suppress riots and that includes the use of flashbangs, stun grenades, tear gas and other similarly dangerous items. The boy who picked up the flashbang/grenade (unclear which one it was) was part of a group of rioters and as such had put himself in a position where he could expect to be exposed to police violence. Had he not been rioting he'd still have his hand but alas, he was, he did pick it up and his hand is gone.

If you have children tell them not to participate in these riots - which seem to be either organised by or used by both Melenchon's communist party as well as several islamic groups to achieve their goals - and, if he ever gets embroiled in one, make his way out as quickly as he can. Tell them not to be like Lenin's useful idiots, henchmen for the revolution who are discarded as soon as the goal is achieved. To those who think this means they should just accept any and all governmental abuse and neglect, think again. There are many ways to act against such abuse and neglect without feeding the communist/islamofascist/${extremist} beasts.

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