"Are you an untrustworthy person?" Are you likely to take a bribe? Will you get mad at your boss and try to burn the place down, literally or metaphorically? Will you be careless in a way that brings about the same, with no malice?
"Are you as trustworthy as anyone else, but subject to inhuman pressure?" Anyone would be vulnerable to having a relative threatened; you probably don't want to hire someone who would be apathetic to having their parents or child threatened. If that relative is already in unfriendly hands, that's a huge risk.
In some ways, a $100k house in a (hostile) foreign country is no different than a $100k bribe; it's just stuff. If you ignore a threat to your property in a scheme to extort you, you are $100k poorer than if you give in, just like if you turn down a bribe. But humans are prone to loss aversion. Having $1 taken from you is far worse than receiving $1 is good, even ignoring any sentimental value of the property in question. Some people will still be able to ignore the threat, not allow themselves to be compromised, but a lot of people will find it hard.
For a job where security is a concern and you have thousands or millions of perfectly cromulent candidates, it's not crazy to winnow the pool first by discarding everyone who's untrustworthy or has extra levers that can be used against them. You still have thousands or millions of great candidates left.
"Are you an untrustworthy person?" Are you likely to take a bribe? Will you get mad at your boss and try to burn the place down, literally or metaphorically? Will you be careless in a way that brings about the same, with no malice?
"Are you as trustworthy as anyone else, but subject to inhuman pressure?" Anyone would be vulnerable to having a relative threatened; you probably don't want to hire someone who would be apathetic to having their parents or child threatened. If that relative is already in unfriendly hands, that's a huge risk.
In some ways, a $100k house in a (hostile) foreign country is no different than a $100k bribe; it's just stuff. If you ignore a threat to your property in a scheme to extort you, you are $100k poorer than if you give in, just like if you turn down a bribe. But humans are prone to loss aversion. Having $1 taken from you is far worse than receiving $1 is good, even ignoring any sentimental value of the property in question. Some people will still be able to ignore the threat, not allow themselves to be compromised, but a lot of people will find it hard.
For a job where security is a concern and you have thousands or millions of perfectly cromulent candidates, it's not crazy to winnow the pool first by discarding everyone who's untrustworthy or has extra levers that can be used against them. You still have thousands or millions of great candidates left.