Bane is the voice of the early 2010s: the voice of the crowd, the voice of the people, the voice of the loudspeaker, the mic check, the megaphone. Bane's is the voice that leads the masses, that speaks to the group, that rises over the contemporary city. Bane is the voice of social media: articulate, mobile, fluid, powerful.
Villain-making is big business in Hollywood, because mag editors and gossip bloggers know that you can eke 10 times as many column inches out of a stormy marriage than a temperate one. There's a lot of sales to be made by turning everyday photos of a normal relationship and storyboarding it into a neat little "heroes and villains" plot.