goodroi - 6:20 pm on Aug 30, 2012 (gmt 0)
One link from a quality, relevant website is not the problem. The hundreds of links with identical anchor text coming from blog spam, directory submission schemes and other short cuts are the problem.
I tend to focus more of my efforts on improving backlink profiles by adding quality links instead of focusing on deleting bad links. Even if you delete every single bad link (and somehow are lucky not to accidentally delete a good link) you still need to build legitimate links. So if you start working on legitimate links you may end up getting enough good links that it naturally defuses the bad link issues.