I'll never understand the people that are hurt by changes to something that they could just avoid. Why does an American movie hurt it? Will it make you enjoy the original less? I'll also never understand the fascination with subtitles and the Japanese voice, which anime fans seem to think is more dramatic.
The people who read the original manga probably feel a certain way about the anime. The same way that people who read books feel about movie adaptions because they know there will be differences in it. A movie can bring things to a wider audience and then a lot of them may check out the original, which they may or may nor prefer.