Refraining from quoting your original post, but thank you, Mrs. P for that well thought-out response.
I think that, in the past, USFSA has made some mistakes w.r.t. team selection. That said, this year is just one of those years where they were faced with very talented candidates and unfortunate circumstances, and they chose what they thought to be the best decision (which I agree with, after having a moment to think over the entire season and what ought to be USFSA's mission instead of reacting purely based on my excitement over Mirai's performance). Whether one agrees with that or not, I don't think anybody can make a definitive case against any subset of 2 out of the 3 top US ladies' skaters right now.
Unfortunate that Mirai can't make World's? Very.
The wrong decision not to send her? A much harder point to prove.