Reminds me of "security expert" warnings in the mass media where every time something happens they tell people effectively the same thing "don't do things unless you know / trust it".
Most people have no clue what they're running and can't possibly take the time to know enough to really have a clue.
Trust is fairly worthless as well. Malware devs buy trusted software to turn in to malware so something that was good and trusted for years is now bad with no warning.
Exactly my thought too. Trust,however, is a weakness. This weakness is overcome by the average web surfer due to knowledge and time constraints or unintended clicks on links and ads. The future hopefully will have security audited browsers which increasingly minimize dangers arising from these actions.
Most people have no clue what they're running and can't possibly take the time to know enough to really have a clue.