Why does Douglass believe that more slaves do not try to escape?

just like different people exist now, they existed then, not all slave owners stood above them with whips. Understand also that some slaves were trusted with children and were "house" slaves/ caregivers and treated as "help" is treated these days. With that considered their "home" was the only home they knew, if there was a place to go, it may not have been better then where they were now. I would suggest that most slaves who escaped, escaped from the south/plantations, where slaves were on fields all day & treated at worst in masses. Lastly, the reprecussions of escaping also