If my friends have trusted me with their information they also trust me to make sure to keep it safe. What service I use to store my data should not be of any consequence for them. That is the same way with this Facebook exporter (BTW, the iPhone app allows one to sync contacts from Facebook to the iPhone address book, which can then get sync'ed to .Mac, Me, or the new iCloud, from there back to a Mac and then back up to Google), it allows the user to get the data from Facebook and store it in their address book. Instead of having to go through each entry one by one this plugin automates the process.
I don't see how my friends that clearly have made this data available to me (so I could contact them) should now have a say as to how and where I store said data. Just because I decide to store it in my address book on Google doesn't make much if a difference, if they didn't want me to have that data in the first place they should have A. never have given it to me, or B. ask me to please remove their information.