Higher risk persons are less likely to get visas from US consular service facilities or are they more likely to get visas from the same?

Those from VWP countries more easily travel to/from/within the US with less extensive checks than those from non-VWP countries, and it is a big part about why the CBP's IAP has the history it does in VWP countries. Perhaps that is a measure of some risk, but it certainly is not a measure of all risks.

I doubt that a Saudi national is anywhere near as likely to smuggle in drugs into the US than a British or Australian national, yet the customs control is more likely to interdict drug smugglers than a variety of other "security" risk persons for which CBP is also tasked to try to interdict.