Terrorism should not be immediately dismissed as it always seems to be. When they say things like "bottle rocket", it's no wonder they're not taken seriously.
As a fighter pilot, would you refuse to acknowledge an incoming until it hit you in the butt?
The altitude indication went from 1500 ft. to 7200 ft. in one radar sweep, an indicated climb rate of approx 1000 ft. per second.
That is some really fast moving swamp gas, one heck of a 'glitch', or a missile.
While I do not pretend to be an expert, theories are attempts to explain data, and the data tell me this is likely not swamp gas.
Your mileage may vary...
I can understand the administration not wanting to panic potential airline passengers, the industry is in rough enough shape now. Without confirmation of the nature of the radar return, it is easy to just say "nothing to see here, move along, please."
After all, that has been done in the past.