Again, most of your CIA employees will never work anywhere else than behind a desk stateside. A few more in embassies around the world, and a vanishingly small segment actually in the field.
Who said anything about soccer moms? Look at academics, do most of them seem super in shape. That's the kind of talent the CIA wants, linguists, economists, foreign policy analysts. Again, physical and mental abilities are not mutually exclusive but obviously most humans don't excel at both. The CIA needs far more of the latter category than the former. You have read way too many Tom Clancy novels, my friend.
And just to talk about how overblown your fear is. Let's go through the chain of events if I'm a hostile power and want to kidnap a CIA employee in the U.S.
1. OK, first I need to identify this employee
2. Then I need to actually find and track them in the U.S. without the FBI noticing
3. Then I need to send a couple dudes to the U.S. without anyone noticing.
4. Kidnap said employee, then...interrogate them? Get them out of the country?
5. After I do that, I need it to look like I didn't do that.
5b. Do I kill the dude?
Your scenario is comically unrealistic. Almost all those steps are impractical to the point of impossibility.