Yes, afordable housing should be available for everyone. But if marginalized people are the ones at risk, maybe the lack of afordable houses is not the only reason.

Not that I question his numbers or sources. I'm just saying that when I discuss data with other people, knowing the source helps to clarify what is being measured and what it means. After all, in my country there are two different (and valid) measures of unnemployement. So knowing which is the source and how they have calculated the number helps to explain why there is a difference.

Not always, other times people just doesn't like the data and what implies, so they reject it without providing sources or just linking to a source that is biased (although the second one is interesting, because they rarely explain how to reach the number, so you know is unrealiable).