Don't take this personally kiwiski, but based on your attitude & views, I hope you don't ski in the US (or anywhere else I might be skiing, for that matter). If you hit someone from behind, you have an absolute obligation to stop to see if the party is injured, regardless of whether it was intentional or not. If you accidentally ran over a kid while driving a car, you can be pretty sure you will be sued, arrested, and/or questioned (at a minimum). However, leaving the scene of an accident is illegal, not to mention immoral.
Every activity in life has risks. There are also rules to avoid & minimize accidents. If you smash into someone from behind, however unintentional, you are at fault (except in very rare cases, such as the downhill skier/boarder stopping in a blind spot behind a hill). Regardless of who is at fault, how can you even suggest that fleeing (because you fear "consequences") is an appropriate response? If I saw you do this, I would do everything possible to track you down & hold you accountable, even if you hit a complete stranger. If the person you hit was being assited, I'd chase you down myself (and, yes, there will always be people on the mountain who can keep up with you). If they needed help, I'd radio ski patrol with your description.
Sooner or later, your utter disregard for fellow skier/boarders will catch up with you.