Yes, both of them violated their Constitutions, both arrested men without trial, both silenced freedom of expression, both fought bloody wars against revolutionaries who had some legal claims to legitimacy. Only those who fail to see in Communist slavery at least an equivalent evil to race slavery will excuse Lincoln's abuses, and condemn Pinochet's. May he take comfort in what he has achieved, if not in how men will remember it. It's the same old story. A great economic reformer uses the extreme measures needed in a third world country, then when the people get relatively prosper they hear about what so called human rights and kill him.
Most views added here are from people outside the third world and think democracy is the issue.
Simply democracy would hinder any real reforms. Gen. Pinochet was an extremely daring reformer who hired 12 of Chicago School graduates to be his cabinet. It's a historic achievement to do such ambitious and radical reforms 'by the book' and with such successful results. Just remember that all great reformers in poor countries were right-wing dictators. Spain, Turkey, Korea, Singapore are among other tens of countries.