Batman and Robin were created in a time when child soldiers were more common than they are now, especially as support staff, and aimed primarily at young ... Never said 'required to kill', I said 'trained to kill' and according to the soldiers I know, the basic training is pretty focused on weapon training. read more
Young Justice (TV Show) also touched on this with multiple folk (capes and otherwise) pointing out that Batman basically is training child soldiers (Robins). Also had a pretty good argument that, at least with Dick, it was about channeling Dick so he wouldn't become as ridiculously damaged as Batman (and, as of season 2, Bruce failed). read more
Bruce Wayne has been the Batman for decades now, and while the city has faced events that Batman’s presence was able to treat, like the aftermath of the 7.6 magnitude earthquake in the No Man’s Land story arc, in general, he hasn’t really deterred crime or corruption in Gotham. read more