R.I.P.
Allende was a communist and was in league with evil. Taking him out was the right thing to do.
Pinochet came to power via revolution. During revolutions, people get killed. Almost all of the ~3000 people who died during Pinochet's tenure were killed soon after Pinochet came to power. Those ~3000 were almost all part of, or allied with, Allende's regime (or useful tools thereof), and they were thus legitimate targets of regime change.
Because of Pinochet, Chile was saved from communist. Pinochet's legacy has left Chile with a vibrant and healthy democracy, a thriving economy, and freedom that they would not have known under communism.
Was Pinochet or his revolution perfect? No. But he did what he felt he had to do, and everyone excepting the communists are better off for it.