What was the AAG's fault?

Recently the government relieved the Additional Attorney General MK Rahman of his post without showing any reason. Sources said that MK Rahman didn't make any strong arguments against the HC's order of arresting the alleged Rab officials in Narayanganj seven murder case and the government was irked by this.
I don't understand what the government expects from its officials. Though MK Rahman has a pro-AL background, the government, (especially the PM) was annoyed with him over a number of issues including the Narayanganj case. So, he has been terminated in a sudden move. This will discourage government officials to act in public interest.