That seems like a much more reasonable and even-handed approach than just simply saying race should never be mentioned.
Singling out the race question as one that needs to be handled delicately is the wrong way to go, in my opinion.
Your suggestion seems to be predicated on the assumption that reducing the number of reports in general is a good thing, but there's no reason to be making that assumption. Reducing racial profiling is a good thing, but that does not imply that reducing other posts is good.
Think about it from the point of view of someone who doesn't interact with black people very often: they probably can't tell whether a person is a gangbanger or dangerous or not. If you can't distinguish a potentially dangerous black individual, then everyone black person becomes suspect, especially if you have a negative view of the group to begin with. People's natural risk aversion and fear of unfamiliarity just heightens this affect.
But presumably, that same person is more familiar with white people and can distinguish real threats, from, say, their neighbor or the kid down the block.