Except you might be forgetting the part where most of Tiger's sponsors returned after initially distancing themselves from him. One thing we have learned about major corporations is that in most cases, all they really care about is their bottom line. If sponsoring Tony helps them sell and remain profitable, then they will stand by him or rejoin him after the news is quickly brushed aside for the next big story.
Personally I think he'll be completely exonerated of any wrong doing. Like it or not the justice system is not fair and equal for all. If you are a person of great wealth like Tony, you have tools at your disposal that others wouldn't necessarily have. In this instance Tony is going to lawyer up, and he's going to have every reason imaginable argued for him and why it was an accident. Poor lighting, driver carelessly walked onto track, steering of dirt car, all these and more reasons why he shouldn't be held liable. He's got millions of dollars to make this go away, and that's exactly what I expect him to do.
I work in the Canadian judicial system and unfortunately this is a reality that we live with. My understanding and through the interaction with some of my colleagues south of the border, I'm told it is even more prevalent in the American judicial system. It's completely unfair that people with means are better able and equipped to defend themselves during these types of situations but this is the cold hard truth. As it relates to Tony, I'm quite sure he probably already has multiple lawyers working towards a settlement and clearing himself of any culpability.
On a personal note, my condolences go out to the family and friends. It was tragic and preventable, however racing is inherently dangerous and all those who participate know the risks and must live with the consequences.