Some thoughts,
It appears that ATC is approving high speed(above 250K below 10,000 feet) climbs in the US when they are not allowed to do so. As someone mentioned, if if greater than 250 knots below 10, 000 feet is needed for safety reasons, it is already approved by the regulations.
If given a vector that is more than a 180 degree turn, confirm the direction on the readback(or reedback as the LAX ATIS always says).
If terrain is high, consider delaying the higher speed climb until clear of terrain for various reasons.
If significant terrain is around, have the terrain display function selected as a backup to a potential unsafe vector toward terrain.