I think the point on slavery is a good one, but one could counter with marijuana laws. More than 50% of the population would repeal them today. Do you think the people would vote to invade Iran or stay forever in some country we've liberated? Maybe not the same scale but real wars and the war on drugs certainly restrict freedoms. the war on drugs more so since people end up in jail which is analogous to slavery. And as far as voting for lower taxes and more benefits, that sounds like what we get today with our reps.
I'm not saying direct vote on things would be ideal, but seems like we have these issues today. I can understand the want to try something different