Unlikely. Media technologies are technologies for disseminating ideas. Different technologies lie on different points of the spectrum between one-to-many and many-to-many.
Broadcast television, and radio to a lesser extent, is very close to a one-to-many media. There might be a small handful of national networks that can disseminate ideas, and they can only do so in ways that are easy to detect and control by authorities. In an authoritarian state like the Soviet Union there might be only state-controlled broadcasting and it really was one-to-many. In a free country like the United States, you might end up with 3-4 broadcast networks. That's not enough to get a broad spectrum of opinion, which is why the midcentury Overton window was so narrow compared to today.
Cable and satellite television went closer to many-to-many. (Print is also closer to many-to-many than radio and television, but radio and television are more popular since they don't require the effort of reading or the skill of literacy in order to consume, so the presence of radio and television reduces the impact of print.) This broadens things a bit because then you can watch Fox News, though the biggest reason for Fox News was probably an unmet market niche. The broadcast networks plus CNN, for various reasons (likely the internal biases of the journalists themselves), had drifted to a noticeable center-left bias by the 1990's. This left a massive opportunity for a right-biased news network to capture a rough half of the market that was "underserved" to some extent. Conservative talk radio was a similar story.
Print was somewhat more broad, but even then, there were usually small numbers of "respectable" opinionated magazines you could buy on either side of the spectrum (e.g. National Review, The Nation, Mother Jones, The Weekly Standard, etc.) but publication was a big enough hurdle that these outlets often served as moderating voices (e.g the National Review effectively excluding the John Birch Society or Ayn Rand from the "respectable right").
The internet is an extremely many-to-many platform. I mean, I'm just some random idiot you've probably never met and now you're hearing all of my thoughts about something of national importance. That's pretty fucking insane when you think about it. And just like cable, talk radio, and publishing slightly widen the bounds of the Overton Window compared to the broadcast television oligopoly, the internet has done something potentially even worse. I don't think there is a single Overton Window at all anymore. And the old media can't handle this. In another era, this National Review cover alone (https://amp.businessinsider.com/images/56a21e51c08a80431d8b8...) would have completely ended a Republican candidate. In today's era, that man is the President. Similar forces have normalized people like Bernie Sanders, someone who actually existed for a long time but would never have become a national figure in an earlier era.
And yeah, I really think this is all part of the same mechanism. People like Timothy McVeigh were radicalized in person. There aren't that many of him. There are a lot of small scale domestic terror attacks and at times even entire mobs of people (Charlottesville for one example, Portland antifa for another example) who commit acts of political violence. And the more these kinds of events happen, and are publicized, the more this type of behavior becomes normalized, becomes something within the realm of things people think about as something that someone might do in a given situation.
