This goes into the territory of whataboutism. Saying that X is bad doesn't mean Y isn't also bad. You're just focusing on X at the moment. It's fine to discuss

This goes into the territory of whataboutism. Saying that X is bad doesn't mean Y isn't also bad. You're just focusing on X at the moment. It's fine to discuss Y too, but consider whether it's relevant to the current discussion or derailing it. It's unreasonable to address all issues when discussing a specific point. Furthermore, it's most reasonable and charitable to assume good faith on the part of your fellow participants. Bringing in unrelated topics just to make some abstract point isn't very helpful to the discussion. Imagine you were trying to open a soup kitchen to feed the local homeless population in your city, and every time you tried to discuss it someone pointed out that there's way more starving kids in Africa, so what about them?