How many stories have we seen where a virus was distributed by an online ad? No thank you. It is my job as a user to minimize the vectors that malware can creep into my system. Since ad networks have proven to be a vector, it is not only my prerogative, but perhaps my duty as a responsible user, to block them.
First item up for business in the next congress. Pass a law forbidding citizens from contacting their representatives or senators. Because, heck, it must be ok since it's all the way at the end of the first amendment.