There is no actual need for IAA to do their job. Thing is, IAA is very optional and unnecessary job. And it has its problems.
There is no way to fix IAA situation immediately, but in my opinion there is a way.
Problems come from general attitude of playerbase towards IAAs, which comes from IAAs behavior. Thing is, often less experienced players take that role, they open up wiki and what do they see?
It is your job to ensure sop and space law are being followed, and if not, you REPORT.
While this is true, wording creates certain impression for new IAAs on what others expect them to do. But in reality, job of IAA is no less roleplay than for example librarian. You should interact only with those, who are willing to interact with you (unless it is head, then they are kind of obligated).
In my opinion, first thing we should do is to tweak wiki description of a job, to make it more clear for people that they are here not to fight, but rather to help and improve. I believe more people will start to behave correctly and less aggressive, other people will become more and more willing to talk when IAA approaches them, and at some point, the situation will fix itself.