Of course I would say it to someone directly involved in the project. I've had projects I worked on go south through unavoidable externalities, of course I felt disappointed but there' no irreversible loss as when someone dies or is permanently disabled. Save your emotions for things that actually matter, an economic/operational setback doesn't qualify.

Seems reasonable to me.

Exactly. That is the problem with the entire PC thing. You have to walk around on eggshells being worried that you will offend someone and never say what you think. I mean seriously. Be worried that someone who worked on a rocket project for SpaceX might be offended by what I say? I am supposed to not say anything because of that?

There's nothing wrong with softening your language a bit just in case someone who happens to be involved sees what you write. If not being a jerk means you can't speak what's on your mind, then that says more about your mind than it does the world.

No, you're supposed to understand the concept of "manners", like a functional adult, instead carrying on like an overgrown toddler.