the discussion tells me that this is about learned-behavior. still using these packages because they gave us warm fuzzies in the past, the elusion of security. I work on a lot of systems, and have used avast a lot in the past [no more] - I have gone back into such 2 years later to disinfect from things that slipped past avast [as well as the other popular packages]. 'tis true that the human is the best and worst part of the security apparatus. "AV" is a misnomer, as we all know. classical 'viruses' are not much of a threat. the most malicious types of code out in the wild will get past all these defenses, as recent events have shown again. but, the most sophisticated code is not really aimed at causing mayhem for the underlings - they are aimed at the corporates. for the average small business or SOHO user of pc's [a shrinking universe now... imploding] the more aggravating "infections" are gray... adware, marketingware, interference-ware, redirect-ware, browser-ware, etc. we can't save people from themselves... if they go installing weather-apps and toolbars, they're going to pay me to cleanup. none of these packages will prevent that [except scotty, in a way, but that too is a learning curve and apt to just annoy the disinterested]
with win8 and win7, there is just no point in these aftermarket utilities and I do not trust the motives of the humans that are left holding the bag on those outdated products. they are susceptible to being "turned" by hefty cash payouts for blackhat meddlers. and I reiterate: you do NOT know what those packages are doing in the background.
there are comments all through this very long thread of this type: "I've used xyz av package for years and 'never had an issue' ". that's hardly a ringing endorsement. the one useful feature of any that has been effective many times has been Avast's look-ahead link detection. I wish all browsers would incorporate this type of technique. best I can tell, only Chrome does so effectively. but the price of Avasts intereference /spamming is too high. its just not a good end user util anymore. I expect many of these will either become marketingware over the next few years, or disappear, and poorly maintained.
think about it: would you put your best/brightest talent on these products, or where the action is in handsets?