Do not consider Collectivists as "sincere but deluded idealists". The proposal to enslave some men for the sake of others is not an ideal; brutality is not "idealistic," no matter what its purpose. Do not ever say that the desire to "do good" by force is a good motive. Neither power-lust nor stupidity are good motives.
Ayn RandMan is the only living species that has the power to act as his own destroyer - and that is the way he has acted through most of his history.
Ayn Rand