I am happy for people to remark on my posts and yes people can and do copy and paste things all the time. Nothing at all I can do to stop that I know.
I have no desire to become the thought police, but I do object to someone being able to lift an entire post, re-blog it in the exact same format, so that should a screen grab be made it looks like it is a post on my own site, still showing me as author, but with my ability to moderate comments removed (I have comment moderation set for a reason after all). Should anything offensive be said, then anyone who doesn't understand how re-blogging works will assume that I have allowed that comment to remain, when in actual fact I have no way to remove it, or even comment directly on it unless the re-blogger chooses to allow me to do so.
I have no desire to control the internet, I just want don't think it is right for comment moderation to be removed at the point someone re-blogs it. If a post already has comment moderation or a no comments allowed set on a particular post, then should it be re-blogged, those settings should remain and the original author should be the one moderating comments, not the person who is simply re-blogging an entire post!