Poche, when only one is excommunicated out of thousands, and it is publicized, that's called propaganda not discipline. It would be a matter of intellectual vice for most, to believe that is an actual sign of overall efficacious enforcement of moral and divine law when vast numbers go untouched.
People who believe something because of a single incident are not discerning properly. Such appeals to sentimentalism rather than reality are a sign of an effeminate approach to discernment rather than appropriate use of the intellectual virtues.
If thousands are murdered every day, and then one murder is caught and imprisoned -- but the police ignore the rest, are the police performing their function properly?
No. Perhaps in North Korea that would pass as efficacious enforcement, but not in a just society.