Pope advocates denying Communion based on Politics?

Wait a minute. Wait a minute. Wait a minute.
Doesn't Catholicism/Christianity advocate that sinners shall be forgiven?

Pope Ratzinger "condemned any Catholic who votes specifically for a candidate because the candidate holds a pro-abortion position. Such a voter "would be guilty of formal cooperation in evil, and so unworthy to present himself for holy communion." The Pope specified that strong and open supporters of abortion should be denied the Catholic sacrament, for being guilty of a "grave sin."

Pope Denies some Catholics Communion