This is in situations where a heterosexual woman gets suspicious if her partner has literally any female friends. What if she started going around and wanting paternity tests of your friend group if they happen to be pregnant, just to make sure you didn’t cheat with any of your friends, despite you remaining faithful the entire time?
It’s important to separate emotion from action. You can experience an anxiety inducing thought (such as my partner might be cheating on me) and behave in a variety of healthy and unhealthy ways.
It is important to healthily evaluate what is a relatively uncommon but seriously hurtful thing that happened to oneself and how that distorts one’s understanding of what’s normal behavior in intimate relationships.
Or else it's just blind trust without any firm footing in reality.
If you can't be arsed to do the test for a ONCE or TWICE in a lifetime kind of event with long term consequences because you somehow feel hurt that your partner isn't a fool who builds his life around blind faith.. well, there's not much to be said...
All this wishy washy pretense about "emotional engagement" comes off as super dishonest, just to weasel your way out of doing a test (which should be a standard procedure anyway).
That's one of those times where the faithfulness has to be put to test.
Trying to weasel your way out of doing it via emotional manipulations is more of a red flag than anything.
Doing a paternity test may necessarily or inadvertently reveal to his wife a limit of his trust for her.