When Kamala was created, she was made to be part of an initiative where Marvel made a big push towards making the Inhumans an important commercial property. Those plans came to nothing. The property failed as a TV show and as a comic book line even with big name creators working on them. If the Eternals movie (which was in the works BEFORE Disney closed its deal to buy FOX and secured the rights to the X-Men films back to Marvel) did well, she might have been revealed to be one of them, but it didn't happen. So, Ms. Marvel became a mutant. Kevin Feige wanted market synergy, so he went to Zeb Wells (or at least the editoral staff) to make this story happen. Why? Because he was working on the movie Kamala would appear next in (The Marvels) and he was writing one of Marvel's most popular comic books. I fully believe that Feige did not have any involvement past this. Why would he? He was only interested in making things line up. I am not going to go into the creative decision that led to them deciding to kill her off. I don't know how anyone felt about the decision, only that they made it. Someone above posted above about people either being too sensitive or reading too much into things in regard to Kamala's death happening in May during AAPI month. Here's the problem with that... Marvel released specials celebrating the month. They knew how special it was and had used Ms. Marvel as a vocal point for it. The second problem is that Marvel made a huge deal about there being a big death coming in Amazing #26. They wanted people to know. When the story "leaked" they got a lot of publicly out of it and milked it for all it's worth. They knew that the way they killed her, how it was carried out, how they selled it, and the ultimate end result would upset and anger people and they did not care. In fact, they were counting on it hoping to tick off as many people as possible. Why? Because an enraged audience is an engaged audience.