Re: Well, that was obvious.
Well, erm ...
US-only wouldn't have done the job. It wouldn't have seeded serious FUD, it wouldn't have led to actions outside the US like Barclays.
It may be that Kaspersky was the only AV vendor who declined to cooperate with the NSA by incorporating their backdoor to snoop, when the spooks made them an offer it was hard to refuse.
Or if there was another, their turn is yet to come, under some different pretext. I expect it would've looked too suspicious to lump more than one vendor together in the same FUD action.