I get the impression that a large number of people feel that way, especially in the US. And that in the US a higher than average proportion of them seem to act on it.
Of course that impression might be just because bad news sells better and hence is more visible.
Personally I haven't felt that murderous since 1975, but I have felt a tinge of it on numerous occasions.
Part of the problem is that due to overexposure to adrenaline in the womb, I tend to view things as intentionally threatening and malicious, where a rational person would chalk it up to stupidity. So when some dumbass passes me on the right, and cuts me off with three or four feet to spare, my first instinct is to assume this person is trying to cause an accident.