I frequently find myself asking, "How many 'isolated incidents' does it take to equal a pattern of behavior? " The corollary in this case is, "How many 'vocal minorities' does it take to equal a significant and/or influential segment of the whole?"
Well, yeah, sure, if you decide to take all vocal minorities that represent subsets of the population, treat them as one, and see how they compare to the total population, they might make up a majority, but that's like adding together all the different racial minorities, comparing them to the total population number, and then saying that because that number actually/factually/numerically represents a majority, they're not minorities. It appears to change the context but does not in actuality. There are some people that are nasty about every subject, but that doesn't mean they agree with each other.