[bigbugbag]

> Either way that's miniscule compared to having a few pictures on your webpage.

A visitor can decide to not display images to improve performance and this will not break the website, blocking the (often not useful) js on the other hand...

> And if someone asked if it was really a good idea to blindly load 3rd party code and run it in the context of your own domain? Even I told people this sometimes: Well if you can't trust Google serving you secure code,

You overlooked the privacy and personal data issue here. It's a bad idea to rely on anything google because it means that you give away the privacy of your visitor to one of the worst offender no less.

> About a week ago Google got caught hosting hostile ads ...

Google has been delivering malware, spyware and that kind of things for years. It was even considered a major vector of infection (usually someone looked for flash on google and clicked on the first results which happened to be a google ad for an infected flash installer)