It is not a good reason to hate members of races of lower intelligence, in my opinion. Before accepting the perspective of scientific racism, I was skeptical of the perspective that there is a widespread subconscious bias among whites against blacks, but now I fully accept it, as I know a plausible theoretical reason for it (not the racist history carrying on in tradition, as anti-racists so often claim). I fully accept that there is a widespread bias against blacks in hiring, in housing, in business and in the criminal justice system.
I expect that the confirmation of genetic racial differences in intelligence (and maybe other psychological traits commonly valued) beyond reasonable doubt will inflame racial tensions. Hard liberals and the insulted races will generally take an antagonistic conspiratorial perspective of the science of genetics, and hard conservatives will accept the science happily to justify racial oppression. There will be much more blood.
So you are saying that if scientific racism was correct, then we should expect violence and bloodshed when people find out; and yet you seem keen to pursue this dangerous knowledge.
There are four possibilities:
Scientific racism is true; People don't know because nobody checked - No change
Scientific racism is untrue; People don't know because nobody checked - No change
Scientific racism is true; People know it is true - There will be much more blood.
Scientific racism is untrue; People know it is untrue - Bigots will be limited to the irrational.
So, to support the proposition "We should try to find out whether scientific racism is true", you need to show that bigotry from rational people is currently responsible for levels of violence greater than that which will arise if it is proven to be true. This seems pretty bloody unlikely.
This is, therefore a rare example of a research topic that should not be pursued on moral grounds.
But, of course, sooner or later people discover the truth - because there are always going to be researchers who don't think through the consequences of their actions.
From the research done so far, it seems that there is a possibility of a small effect, that is swamped by the large variations within the groups being studied. So the question 'Is scientific racism true?' needs to be restructured; the real question being 'Is scientific racism
sufficiently true to be useful for making predictions or decisions?'. The answer to the latter question seems to be 'No'.
Given that the answer is, from current data, very likely to be 'No'; and given that IF the answer was 'Yes' it would cause an increase in violence and bloodshed, you should perhaps be rather less surprised that people are vehemently opposed to people trying very hard to find ways to get a 'Yes' answer.
A quick thought experiment - If white folks were shown, on average, to be 20 IQ points less intelligent than black folks, then this would be of vague interest to anthropologists and evolutionary biologists; but it would not be a useful fact to anyone else - people interact with individuals, not races, and if you are (for example) looking to employ an intelligent person, the applicant pool would consist of similarly intelligent individuals due to the academic qualifications you ask for. That four of your five, or nine of your ten shortlisted interviewees are black is of zero utility to you in your selection process; it is of trivial academic interest only.
If "Scientific racism" is looked at from the POV of being scientific, then it is not useful outside a handful of narrow academic fields; If it is looked at from the POV of justifying racism in real-world situations, then it is not rational, and is unworthy of the prefix 'Scientific'.