To tell you the truth I have no clear cut idea towards why Bane could've possibly been portrayed like that. It isn't exactly like Joel Schumacher had sheer and utter contempt for the character like Sam Raimi had towards Venom when he was making Spider-Man 3. I recall that Schumacher wasn't fully aware of the character until his godson told him about him.
I'm assuming that Bane was put in there as a means of raising the merchandising potential. Because naturally, having three supervillains (Mr. Freeze, Poison Ivy, and Bane) instead of two like in Batman Returns and Batman Forever, could possibly mean that more toys and what not could be sold. Also, I'm guessing that it would've been awkward for Batman and Robin to actually engage in a physical confrontation with a woman like Poison Ivy, so Bane was put in there as a way for them to fight Poison Ivy by proxy.
reply
share