Just need to vent:

Unfortunately, I cannot do so here, because the nick name I use here is one some may recognize.
I don't want to upset anyone, so just know that I'm very frustrated on my current project, and can't seem to understand how certain things can come to be. I genuinely want to help my customers succede, but occasionally, something happens that makes them believe otherwise. I work very hard to prove that decisions that were made had merit, and that the conclusions then are still accurate, but sometimes, even proving to them that my decision will make that customer more productive and is less expensive than what they are asking for, isn't enough.

I hope that all here can recognize how hard it is to satisfy your wants, needs and contractually agreed to requirements.
Be nice to your suppliers; tooling, workholding, software, consumables like coolant and oils, and machines.

Thanks for letting me vent in the most politically correct way I could.
Have a good evening.