By censoring certain vanity cards, CBS is bringing focus to them. The censored vanity cards are listed under "Internet references", below.
Chuck Lorre: #223: An open letter to Sumner Redstone, the owner of CBS's parent company, offering "condolences" for his recent divorce from Paula Fortunato along with suggestions for restarting his romantic endeavors.
Chuck Lorre: #217: A list of near-dirty words that aren't actually dirty, but which confuse the CBS censors.
Chuck Lorre: #198: An idiosyncrasy of CBS censorship: Why the pedophile clergyman in The Big Bang Theory is a "chaplain" and not a priest.
Chuck Lorre: #178: A jab at homophobism, full of double-entendres, claiming to be an effort to garner GLAAD support.
Chuck Lorre: #171: A joke about a bear who repeatedly sodomizes a hunter.
Vanity card #226, shows how negative criticism can bring attention to something. In #226 Lorre gives a sarcastic "thank you" to the Parents Television Council, which by criticizing Two and a Half Men, actually boosted its ratings.
Vanity card #217, a list of near-dirty words that aren't actually dirty, but which confuse the CBS censors.
Vanity card #155 explains criteria by which the FCC should evaluate TV shows, in which love, beauty and humor are considered "good" whereas hate, violence, and degradation are considered "bad".