…erm, don't you mean "OCD"? OTC is "over the counter", last time I checked. (See? I'm more OCD than you, or perhaps I'm available without a prescription.) Striking comments is most important in more "official" spaces (deletion discussions, etc) because the original comment remains visible that way, with something indicating that the user has changed their mind or whatever. To strike text, wrap it in tags like this, which produces tags like this.