I definitely doubt things were calmer in general, because as you say, there are a bunch of examples of the opposite. However, an interesting point is that the groups in question, in the past, were somewhat restricted to their geographical location, and were in many cases dependend on organized leadership. As I see it, these two points are less of a challenge now.
The number of radicals might be the same, but the internet gives these existing radicals a much easier way to establish communities than before. As far as I know it's an accepted fact within social psychology that groupthink causes radicals to become more radical, which could suggest that even if the number of radicals is the same, these same radicals might become more extreme.