I believing in supporting the people who make the content that we enjoy, but you have to admit, there are some sites which are downright malicious with their ads, for example I am sure you have been to tomshardware.com before. Some sites do not just simply provide an unobtrusive ad experience. some go out of their war to cause harm. for example sites which use static ads which follow as you scroll. They wreak havoc on IP panels which are at high risks of image retention and burn in. I don't like seeing an after image of a random prebuilt overpriced computer or smartphone when I leave a website.
Some sites (this included) also choose to do what is essentially the digital equivalent of an IED/ roadside bomb. Your mouse cursor touched the wrong part of the webpage and you get an obnoxious bandwidth hungry ad ad that covers the content you were looking at. That is purely malicious and will never work as an ad. Imagine if burger king tried to advertise a whopper at the regular price, by taping their ad to a brick and chucking it through your house window. Yes you will definitely see the ad, but I bet you wont be going to burger king after that.
Some sites will use ad takeovers which dim and cover the entire page with a giant ad.
Some sites will very bandwidth inefficient ads. e.g., sites like this will often have about 70% of a page load data usage, as ads; not very good for users on data caps. The bandwidth usage is a real issue, and while data is technically not a limited resource, ISPs like to create artificial scarcity in order to extract more money from people, and sites like tomshardware are part of the problem, they use bandwidth hungry ads and never take a stand against this anti-consumer practice by ISPs.
I am an adblock user, but I rarely have it enabled on sites that I like, with the few exceptions being sites like this which use incredibly obnoxious ad practices.
-------------------------------------
Saying antivirus prevents the spread of malware from ads, is a complete lie. Those forms of malware are risky to the malicious user, and thus they make damn sure that it is a zero day exploit with malware that is not currently detected by the antivirus.Remember, both legit users and criminals have access to the same virus protection software.
Remember the devs in antivirus companies are not psychic, they do not magically know the instant new malware is created, instead, they take a reactive approach.
When infected game mods started popping up, it took the major antivirus makers over a week to release an update that would detect them. new malware is constantly being created and the people working to detect it are only human, they cannot focus on everything at once. It takes time to detect new malware.