Final answer:
Promoting regional conflicts on Earth is not an argument in favor of space colonization. It is a potential negative consequence that could result from misallocating resources to space efforts instead of solving terrestrial problems.
Step-by-step explanation:
The question asks about arguments not in favor of space colonization. The options provided include arguments for space colonization such as expanding human habitat, accessing extraterrestrial resources, and mitigating overpopulation on Earth.
These are often cited as motivations for seeking to colonize space. However, promoting regional conflicts on Earth is not an argument in favor of space colonization. In fact, many argue that the resources and effort put into space colonization could instead exacerbate existing problems on Earth, including regional conflicts, by diverting attention and resources away from these issues.