Earlier quoted context omitted.
Ad networks strive to filter these out, so it's not an argument against ads. Otherwise, you could say let's not use, for example, app stores, because sometimes malicious apps can get through the checks.
Having an extra layer of filtering is good, but time has shown it to be less effective than adblocking. Your app store example is a non-sequitur, because users want to download apps. Users in the general case do not specifically want ads.
True, but users want to access content for free, they don't want to pay for every site they visit. And currently it's only possible with ads.
And most users rather bear ads than pay. If everyone uses an adblocker then most sites will either close or become paid.