Discovered another reason why having a rebuild likes option would be incredibly useful.
There was a bug in XenForo in which when you deleted—either soft or permanently—profile post comments with likes or profile posts containing profile post comments with likes, the like counter was not updated accordingly. This was fixed in XenForo 1.5.8; unfortunately, the fix is not retroactive, so the only way to fix the bug for that type of content deleted before XenForo 1.5.8 is to restore the content and then delete it again. However, this isn't the most logical, and if you permanently deleted that content beforehand, then the like counter will remain inaccurate.