Board Thread:TV Show Discussion/@comment-3035448-20160822204921/@comment-5308269-20160823003331

Not everything that has happened in the past is Bran's fault. Madness due to hereditary incest is easily the reason for King Aerys losing his senses. That he was a capable ruler beforehand does not negate this possibility. As for Bran, most of his work rests in the present. For all anyone knows, the White Walkers may not have been active during the reign of King Aerys, so I'm not sure what anyone expects Bran to do with a long dead ruler in respect to the White Walkers.

And Bran "STILL visiting the past" was not for voluntary reasons. The Three-eyed Raven brought him back because he alone knew the reason for Hodor's loss of cognition, and needed Bran to warg Hodor from that specific moment in the past. Otherwise they all would have died in that cave. He also needed to upload his knowledge into Bran's head, so the Raven needed him to stay in that greensight-state for the process to take effect.