"it needs to be done slowly, in a sensitive manner" I'm not sure "sensitive" is the right word, but I would go for "done in a manner that doesn't lead to mass

"it needs to be done slowly, in a sensitive manner" I'm not sure "sensitive" is the right word, but I would go for "done in a manner that doesn't lead to mass deaths". About 600,000 people died in the US civil war. It would have been better if the slaves could have been freed with fewer deaths, even if it took a few years longer. (Note: I've no idea whether there was any real possibility of that.)