Aspirants should approach controversial issues in UPSC essays by maintaining a neutral and analytical stance. They should present multiple viewpoints while ensuring arguments are evidence-based and coherent. It is crucial to avoid emotional language and focus on providing balanced insights. Citing relevant statistics, case studies, or expert opinions can lend credibility to the essay. Additionally, addressing counterarguments can showcase critical thinking, helping to produce well-rounded content. Finally, concluding with a reasoned summation of viewpoints presents a comprehensive reflection on the issue.