Which would be more likely to pass impact forces into the bike frame and break the aluminum step and/or bend the frame vs deforming slightly and absorbing some energy?
As Kyle Bradshaw ex of Cruisercustomizing.com said once "In the US they are now called highway bars and not crash bars for fear of being sued in the event of the bars not saving the bike and/or rider."
In other words, we should only expect them to perform either while the bike is travelling at zero or very slow speeds.
Paul