There's any number of ordinary, readily available household devices, products and chemicals which can be used to hurt, main or kill others. Banning or restricting just a tiny number of them isn't going to make any difference as the idiots who do such things will simply find something else to use.
IIRC there have been no reported acid attacks since the arrests a week or two ago which might indicate that there is no epidemic. Just a few dodgy people can have a hugely disproportionate effect on crime levels. We can't cure this problem, all we can do is set punishments which act as some form of deterrent and for those who won't be deterred, keep locking them up.
