Blizzards WoW is biggest main stream MMO in the genre as such basically sets the standards for the industry, Ghostcrawler lead developer of WoW ushered in the "toss crap out there and see what sticks then remove what doesn't later our customer base be dammed" style of programing that is now emulated throughout the industry.
A nerf is a failure of the developer to foresee the impact of changes he/she makes even though said developer should have thoroughly tested those changes prior to release on a live server. Therefore a nerf is either due to laziness or incompetence!
It is now done so much they we have become accustomed to nerfs being part of the games we play when they never ever should have been.
When a developer punishes their entire customer base for their own mistakes, and treats them with a shut up and deal with it attitude, particularly when the customers are paying monthly for it and or have a significant amount of their time invested in, it is naturally going to breed resentment and anger.
I don't agree with harrasing/stalking game developers in real life but Developers are not the victims here, the customers are, developers are just getting as they give.
If they want it to stop the first step is no more nerfs, or at least only as a last resort and should be accompanied by a public explanation and apology when it has to happen, preferably from the CEO of the company.
You treat customers with dignity and respect you get happy, loyal , repeat customers, you treat them like a bunch insignificant cattle you get a stampeded, game developers are getting stampeded.