And it's not like I'm advocating that every single company needs bulletproof security that can stand up to nation-state adversaries with budgets bigger that the company, I agree with GP that it just wouldn't be economical.
To stretch the car/driver analogy, you could limit all cars to 10 mph so that they can stop fast enough when a deer runs into the road unexpectedly, but that's probably not worth the tradeoff.
Pedestrians, on the other hand, are a predictable fact of life that you need to deal with when you get in a car. So are bad people on the internet. If you put something on an internet connection and aren't constantly aware of that, you should not be putting it on the internet.