Liability wise, you have to operate within your training,
and you want to cause no further harm.

And you have to use good judgment.

If you are in an urban area and know help will be there soon, it may be better to stay out of the way.

If you are in a rural area and the EMT's won't be there for 45
minutes and someone is lying in the road on a blind corner, you
may want to move them.

You may want to do things for your own family that you may not
want to risk on a stranger, sad to say.

Having the equipment available can be helpful in those rural settings too, if an off duty first responder etc. is there but
without the gear.

Be sure and treat for shock.