I think being able to like or dislike a post could be misused (if you cared about what people think about what you post), it could stop people posting on the forum (thus keeping the board streamlined, or curtail further conversation).
However this is EllGab, everyone is adulty enough to rise above favouritism, and if they aren’t we’ll enjoy the arguments that ensue. For me the takeaway is if you don’t have the balls to reply to it, you maybe shouldn’t have the right to like or dislike it, thus in effect potentially negating the need for like and dislikes.