This question is prompted by the new television show, but I'm open to any sources for explanation.
With reference to this particular scene from the season's trailer, The Flash saves a person from being hit by a car by running up and pulling them out of the way.
However, this doesn't seem like a great idea to me. Written satirically, let's examine what could be going on in Flash's mind:
Oh--Look over there! There's a person who's about to get hit by a car traveling ~40mph. If a car impacts them at that speed, they're nearly certainly dead. So, I'm going to run at least 10 times faster, and whisk them out of the way so fast they will die from internal injuries and whiplash-like effects instead!
Basically, my question is as follows: Given that the rapid acceleration of organs (and the resulting force) is typically what kills people in high-speed impacts, why doesn't The Flash end up killing all the people he's trying to help?