You could just describe what you see as being the problem, and why, rather than using the extreme, inflammatory language.
If a few people made a mistake, that's a different thing than condemning everyone in the entire agency, most of whom work in other regions and in other roles and have nothing whatever to do with the decisions regarding that dam.
There are a lot of good people working for the PFBC and there's no justifiable reason, or benefit, in being rude to them.
Regarding the "unsafe dam" thing. I'm not sure what the situation is with that, but there have been a great many dams across the state that have been identified as being "unsafe" in recent years. I think it's DEP that has been pushing that. And just why there have been so many in the last 10 years or so is something I don't really understand.
Maybe they just started inspecting them more and have identified a lot of problems that were there all along but no one paid close attention to in the past?
Or maybe the construction methods considered standard back in the day are now considered very poor by modern standards.
But I know that this "unsafe dam" issue is not solely with the PFBC. Many dams under other ownerships have also been declared unsafe, and either removed, repaired or rebuilt.