Re: "People don't hate adverts, just awful adverts"
True for some.
Some do hate them all, some hate their bandwidth requirement, some hate being tracked for advertising purposes (or indeed, mostly any purpose) and some hate the increased risk posed by poorly vetted 3rd party "source injection" (for want of a more accurate term occurring to me while I type).
There are likely others too, but that last one is where the assumption that adverts = insecurity is clear (though tracking and theft/misuse of that data is another type of insecurity too).