[dfxm12]

The more people you trust, the more susceptible you are to having that trust broken.

Let's say you trust Chrome, you can't trust AdBlock just because you trust Chrome. The install on the Chrome store could get compromised, somehow.

In this specific case though, you also have to weigh the risk of an attack being delivered from an ad. What's more likely? One of the thousands of ads you view a day launches an attack, or installing a Chrome extension does? Which would be more damaging?

Security is not an exact science. It's all about weighing options and making informed decisions.