I also agree, we shouldn't be invovlved in any sort of voter fraud, even if we don't intend to commit fraud. Besides, people who would do this are liars and cheaters by definition, so I bet they don't intend to change their votes anyway.
Same question that went a-begging to another poster, previously: how, precisely, is preventing open, transparent voter fraud on the 'Rats part the same thing as committing voter fraud, pray...?
Sorry... but: this objection simply doesn't make sense, really.