Finding his accounts isn't difficult, because they all do the same thing, and mostly follow each other; I track them by their hashtagged abuse. Twitter's internal block list, under settings, keeps track of everything you block and has the option to export that list.
Someday, if I find he's not obsessively making so many accounts to spam, slander, and attack with I'll export that list to share with the others he harasses.
Those multiple uber accounts are ridiculous, more of his spam, but nothing compared to that Phelps account. For a man who claims to support the LGBTQ to make an account to threaten to rape people with, under the guise of that accounts specific theme, is disgraceful. I'm not too sympathetic given who the account is targeting, may all who are members of the Westboro Baptist Church burn in Hell, but that doesn't excuse what he's doing.
Identifying the Phelps as his was easy. He is the only person I know who regularly favorites his own harassment tweets across all his accounts, but also the only accounts who retweeted the tweets on that account were his already identified other accounts.
The theater account in the above is one of his many. When confronted about having so many by Twitter, his claim was each account represented one of the locations his theater worked out of. Not for nothing, the website for his theater claims they perform at less than 15 locations, and he has over 200 of these theater accounts.
And even if he had been telling the truth about that, it wouldn't excuse these 2.
These 2 aren't the only time he used the duo spelling of theater & theatre.
Other than using them to spam, and possibly connecting them to some money making app, I can't for the life of me figure why he has so many of these accounts.
It's important to keep in mind this obsessive cyberstalker doesn't make only multiples of these theater accounts. He has other accounts, like those uber ones pictured at top, which he also makes an insane number of for spamming reasons.