That question is a poll of sorts. The goal of each post is to highlight a specific suggestion. So, to that end, it makes a bit of sense to highlight what the suggestion is about for people.
Consider a similar situation with this post on Meta. Each answer indicates a different element. The core of each answer is in the first sentence, and while it isn't necessary, the italics are certainly helpful to the skimming eye.
As for what to do in general cases, if it's really bad then either edit it yourself if you have the right reputation (much easier for CW cases like this), or comment about it. If it is serious formatting abuse, you can flag it for immediate action.