Come one, son. That's piss poor arguing.
How do you determine how much of an impact something has on a group. Let's use the entire US population as that group. You need to have metrics. Is is something that causes physical harm or morbidity?
If you're looking at something from a public health perceptive, obesity is at the top of the pile. It doesn't mean that racism, or discrimination, or another other of societies woes are no longer an issue.
No,
this is poor argumentation.
Sometimes, metrics don't exist because the topic is so abstract or so complex that we don't yet have a system by which to measure them. How evil was Hitler? Well, we don't have an evil-o-meter, so I suppose we should conclude that he wasn't so bad. In reality, reasonable people can reasonably agree that he was one of the worst people of the 20th century.
Keep in mind that the fact that we don't have a metric
yet does not mean none will ever exist; neuroscience is still a nascent field and our ability to measure behavior is in its infancy. But that doesn't mean measurements cannot exist, and it doesn't mean we can't try our best to reach reasonable conclusions even without metrics.
There was a time when Newton's
G constant had not yet been calculated precisely or, for that matter, even been thought of at all. We had no way to measure gravity or gravitational acceleration. But that didn't mean gravity did not exist, and certainly any reasonable person would have been able to know an apple would fall to the ground when you let go of it -- you didn't need precise metrics to understand that.
In short: I agree that metrics are very useful, but it is extreme and absurd to suggest that we can reach no conclusions or have any reasonable idea what's going on without a flow chart to guide us.