If we can't discuss these issues among ourselves using the "real" words because it might upset conservatives, then all we're doing is self-censoring and normalizing the status quo. And science isn't about removing your emotions or biases from your work, it's about being open about being wrong and letting your peers review your findings; you don't say stuff to find people who agree with you, you say stuff to challenge or be challenged on your conclusions. A ton of real progress has been made on social issues by people having honest and direct discourse, it doesn't make all of that irrelevant just because ignorant people still exist. I believe you're mischaracterizing the process of discourse.
And in any case, it's broadly not helpful to minorities to talk about empathy and then in turn say that it's not effective for them to advocate, even if you really mean it. White people have a history of saying they support racial equality and then being unwilling to do anything towards that goal, or saying they want to support social justice but only up to the point where it stops making them feel good about their personal moral stand. If you act like you'll only support them if you feel like you're getting credit ("I'm not racist, I voted for Obama!"), then there's no way they'll ever believe you truly empathize with their struggles.
Nobody is saying you don't mean well, really. They're just saying that what you're trying to do can be very hurtful, because it's what "allies" always do to de-legitimize strategies that are actually pretty effective since it forces them to actually stand up for the ideals they support.