Is it paranoia --
-- if they really are out to get you?
All of the US intelligence agencies (16 of them? I forget) agree that Russian actors used 'cyber'-stuff to influence the recent US election. ('Cyber' --what a bad prefix. But it covers internet dis- and dys-info, voting machine hacking, and a range of other computer-related attacks and activities, so I guess it stands.)
The Russians have played naive Americans for fools (see D. Trump Jr. and Jared Kushner, et al), and have turned Americans into Russian tools (see ex-general Michael Flynn, now under threat of felony charges for serving Russian interests in the Middle East. Again, et al.)
Point being, we know that Russian interests are actively infiltrating and subverting Western systems.
From a Western perspective, Putin's government is corrupt, authoritarian, and militaristic; and Putin has expansionist hopes. The nature of Russia's oligarchic power structure means that corporate leaders find it very much in their best interest to cooperate with high-level political actors. If they do not cooperate, then their business may not survive. And they may not personally survive (see Boris Berezovsky, for example). Eugene Kaspersky, and his company, have survived. It's typical that we would not know what deals a Russian businessman made under whatever tables in order to prosper in that milieu.
I think that the NSA are quite good at gathering info, and I think they are quite overwhelmed by the volume they are collecting. I think they usually can't find a cow in their massive haystacks of data, let alone follow threads back to each hidden needle in the haystack. IMHO, the Russians have the NSA well outclassed in offensive tactics and strategy. I think the NSA (and other agencies in the know) are running scared. They don't think that they have the ability to know if Kasperksy is on the up-and-up, even given source code.
There is therefore probably a large amount of hand-flapping going on, but also quite a volume of genuine cold sweat -- because of what we know about Russia, its leaders, its sophisticated and aggressive actions, and its current level of antagonism toward the West.
Is this more like historical McCarthyism, or more like historical Cold War era intelligence battles?