I would say the most practical approach to the issue is "What can you scavenge from a car without disabling anything important?"

Without decent tools, you can only go so far anyway. And most people in most situations will want the vehicle back, or need it to bug out after the initial crisis.

For example, stuck in a three-day blizzard I'd be willing to:
- cut up seats to supplement clothing and bedding
- cut off seat belts in the rear to improvise a tow rope
- pull out speaker wire for cordage
- pop off the glass in a side mirror for signalling

Since these things are repairable/replaceable, they do not really trash the car. People might be more willing to do them as a result, perhaps leading to more positive outcomes. My 2c.