US Navy detected Titan’s likely implosion
theguardian.com
theguardian.com
It’s the tradeoff between 5 civilians and potentially hundreds or thousands of sailors in wartime.
Finding debris within 3 days of searching actually sounds really fast given how huge the ocean is, how crap cameras are underwater, and that the USCG has to travel to the area. The USN was probably actually extremely helpful for the USCG to find the remains so fast.
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I think the best parallel is the MH370 flight. There's now way will all these spy satellites a flight near China wasn't on some camera/radar the entire time but I bet the USG/partners knew the flight crashed at a high speed and so there's no survivors.
[1]: https://en.wikipedia.org/wiki/Soviet_submarine_K-129_(1960)