There wouldn't be many pilots around that deliberatly flew into wires so its a bit redundant to say that they shouldn't. Most ag pilots will tell you to watch out for the wire that you know is there because statistically thats the most dangerous. I personally know a pilot who was saved by the WPS (Wire Strike Protection System)when he accidently flew through a set of wires. Scratch marks made by the departing wire could be seen on the bubble. Very sobering indeed.
Having said all that I'd just like to add, "I'd rather have 'em and not need 'em than need 'em and not have 'em".