We need him

>>213119133
>>213119183
It makes sense when you realize The Riddler (not just in this movie, but in the comics as well) has always been about serving his own ego and proving how smart he is. The people he kills in the first half of the movie are pretty deserving candidates and all, but it's not really about justice for him as it is about proving he could do this, gain followers and get away with it. To him, proving his intelligence is all that matters, and if he can do that he considers himself "better" than others.