I'll give you one out of two. The first point you make is valid. It is one of the purposes of the complaint process in the institution, and it was spoken of when I was on my tour, that it is to serve the purpose that you stated.
The second thing, though, I disagree with. The complaint process should be used for legitimate complaints, not as an outlet or a means of venting. There are other things offenders can be doing besides filing a complaint. I think it's also important to note, and you spoke about it being a release.... If there is a legitimate issue within an institution that is going to affect the safety of a particular inmate and they issue a legitimate complaint or a grievance to have that heard and to have it resolved...if the system is bogged down by frivolous complaints by people who are just abusing it or taking advantage of it, to either harass or as a game, they are actually taking away valuable resources from the offenders who actually have legitimate complaints that need to be dealt with in a timely manner.
Contrary to what you're saying, I believe by improving the system and closing this loophole we're going to help the majority of offenders get their legitimate complaints heard and processed, and actually provide a safer prison system at the same time.