It's a really good question in Chinese. Because it seems hard to feel the tone/manner of speaking of this phrase for foreign learners. But it's also easy if you try to feel it with your heart. The speaker's original meaning is"别叫我会长，都是你们害的(我被叫做会长)" "it's all your fault that you make others call me president!" But he says this sentence in kind of a sarcastic way, in order to emphasize his expression. we usually say "还不是" in a intensive tone，just like "It's just because of you!!!! " eg ----Tom:"这家饭店菜好难吃，我们为什么来这里呀？" Amy:"还不是你推荐给我的！！ it means It's just because of you who have recommended this suck restaurant to me！！ By usuing 还不是，this phrase could make your expression very active and vivid.

“还不是”equals“就是” “还不是你害的” equals “就是你们害的” “还不是” is an emphatic expression. "Don't call me president(I'm so so angry)! It's all your fault!"

这可以认为是个反问句“还不是你们害的？（an interrogative sentence with certain meaning)”，如果语气变得平缓一点就是“还不是你们害的。“ I don't know if I express clearly enough ,excuse me for my poor English. : )