No, we haven't. 19th century and Nazi theories of race were not based on good science. They were based on atrocious science. Which doesn't mean that it is impossible to do good science on the subject.
It didn’t turn out too well last time.
Quite right. I agree 100% it is a dangerous area.
But research on genetics is not going to stop. Far too many potential benefits. Whether it is the intent of the research or not, data is going to be acquired on whether real differences between "races" exist. That data is going to be available for analysis.
IOW, it's like the issue of cloning humans. I think it's a really dangerous area. But research on it WILL continue, in China or elsewhere if we outlaw it here.
Science is a (one) way of determining the truth about the world around us. Resolutely ignoring the monster under the bed won't make it go away if it's really there.
We're heading for an Emperor's New Clothes world. It is possible that at some point the evidence of racial differences will become so overwhelming that moral and ideological qualms will be crushed. IOW, the world is as it is, not as we wish it was. Ignoring the truth because we don't like it will normally just make things worse in the long run.
People already don’t ignore the truth, though it’s unspoken and often subconscious.