Well, allow me to speculate a bit.
Assume that for this “explanation” of complete unbelievable coincidence was just as it appears - a cover story.
Ok. Now the question to ask is - IF it is, WHY?
What possible reason would the NYPD and the NY media choose to put out such a ridiculous assertion? What overwhelming (since it has to be overwhelming) purpose would this serve? What is it preventing?
What it is preventing is civil war. Be honest - we’re teetering on the edge of a nation-wide revolted explosion of mortal anger towards the left. Serious people know that the American culture is not at all merciful when roused. And serious, sober people know that this or things like this may be the last straw on the camel’s back. They’re lying to try to reduce the chance of a vicious, internecine Total War.
This kind of whistling by the graveyard will work once. We’re good people here in America, but we have our limits. We’re likely to allow THIS to pass, but not one single incident more, I think.
You make some valid points and it was kind of the direction I was going. If this is labeled terrorism then it would make a public acknowledgement that there are very dangerous elements in the anti-war movement. From there many that are "on the brink" would assume a huge conspiracy against them which of course would create even more brinkmanship. And from there...
I think your point can be applied to the JFK assasination and wherever the truth lies. It certainly isn't that Oswald did it all himself and the evidence seems to be clear that there was no evidence to link him to actually shooting JFK. But the fact that a supposed communist sympathiser that had lived in Russia was the sole culprit eliminated possible war with Russia/Cuba if the source couldn't be contained to one perpetrator.