I only wish we knew more of his actions, for example, did he ever use edo tensei for a good cause? Did it prevent a terrible deed from happening? We don't know, so as for that, it could have been that he created the Jutsu and decided it was way too powerful and decided never to use it, in which case he should have destroyed the evidence of it, which he didn't because others have learned it as well.
As of right now, his jutsu certainly has caused the deaths of many people, did he curse the world? Maybe...