The following questions can be asked of people (e.g., family members) who somehow manage to form simple opinions about very complex events.
Q1. Where have you learned about the event? First-hand? Or second-hand, through the media?
Q2. Have you ever sought out news about the event?
For example, have you ever had a question about the event and then sought an answer yourself, or do you learn about it as presented via friends and/or the media?
Q3. Have you tried your best to consider the perspective of both sides involved? If so, is there a benefit to you personally in arriving at a definitive opinion?
See Q2.
Q4. (If mentions of reverse-racism come up, for example: "If it was a white kid who'd been killed, this wouldn't be such a big deal.") Have you considered multiple reasons for why this might be the case?
E.g., the only explanation is not "White people always get blamed for things like this, therefore, this issue is not important."