I take it as axiomatic that understanding the truth is better than believing in a falsehood. The latter almost always leads to gaps that can be exploited for potentially nefarious purposes.

In this particular case, the reason that theft is wrong (because it deprives another person) is very different than the reason that copyright infringement is illegal (because the founders wanted to encourage invention by granting limited monopolies). If people believe that copyright infringement is theft, however, then powerful corporations like Disney can convince them that copyrights should last indefinitely.