Now, I'm quite used to hearing that things are evil. One might say it comes with the territory, but hear me out on this reposting issue.
When people repost you, they are helping you find others in the community who relate to you. Let's say PastorMike posts an uplifting message and BadlyDrawnStickMan reposts it. People who don't know PastorMike but know Stickman will see the post as a friend's post. They might then say "hmm, this Pastor Mike sounds like the type of person who I want to connect with." Which means Pastor Mike can gain friends that he might not have had before.
Of course, there is a certain etiquette to be observed with reposting and times when a comment is better than a repost. If someone shares a personal post with friends, one generally would not post that but rather leave them a comment and your best wishes. However since etiquette sometimes fails, you can turn off the repost option for those sort of posts. (There's also a Block button for those who truly don't understand etiquette)
But look through the thoughts blog listing and see how often people share a favorite song, a pleasant picture or an uplifting message. When you repost those, they are attributed back to the original poster. It says "hey, this person posted something I like and I want to share it and let you know who they are." When done right, it is a thoughtful thing to do.