Cardinal says education on abortion more effective than sanctions

Los Angeles Cardinal Roger M. Mahony said he believes the church's efforts to educate people about the reality and immorality of abortion are more effective than imposing sanctions on politicians who support legal abortion.

After 30 years of "education", why is it that so many still "fail" to understand, or even worse, outright reject the Church's teaching? I suppose one only has to consider the source of rhis profundity regarding education.
Link here.