My take, followed by a story…
I’m a security supervisor for a contract security firm.(Rent a cop basically)
If it just occurred, and I saw it happen, I stop, witnesses make reports more accurate, and unbiased. If there are people standing around looking like they are waiting, I’ll usually just stop briefly(if possible) and ask if things are ok, if it’s a single vehicle accident, I usually stop to keep them company, since waiting for a tow or police sucks.
I witnessed an “accident” where a car made a quick left turn to get through a light after it turned green so he didn’t have to wait for the cars that were proceeding through the light, a motorcyclist could not see this, as he was in the far right lane, and his view was blocked by a line of SUV’s, so when the light went green, he was already slowing, and accelerated to continue, and the left turning car caused him to rapidly brake and lose control (being a security officer, I’m trained to be constantly aware of my surroundings, hence this next bit) While he was sliding down the road, a vehicle was approaching behind him, and failed to notice, and didn’t slow, as I saw this, I swung out of the lane I was in into the path of the oncoming vehicle. The driver noticed, and slammed on the brakes, but not before hitting me. Better me than the motorcyclist, I say.