Honestly, this is a very sad situation for everyone. The first thing I learned when I went through the DWI section of the academy was that person you come into contact with is your responsibility from start to finish. Even if the person had a residence here, and they dropped him off at the house, and the same event happened... The outcome as we have it now would, in my opinion, would still be the same. I agree the dash cam footage will sink them and probably one of the major reasons charges were brought up against them.
I do not wish any ill-will on anyone in public safety. I agree with John, intoxicated subjects are one of the most difficult to deal with. But just like we can not leave an intoxicated subject on their own, these officers should have taken more steps to preserve life. Yes he was illegal, yes he was intoxicated, yes he was driving illegally. The sheer fact that he was intoxicated, involved in a crash (on a highway no less), and the fact that he was an undocumented alien should have sparked that the officers should have done more than just "drop him off at the taco bell" because they figured they figured "they'll have someone there to interpret."
Just a very sad situation all around.
EDIT -
Yes I know I will get flamed for my point of view. So I will add, I know everyone is overworked, everyone is on a more stringent budget, everyone is tired at the end of the shift and no one wants to deal with that "one last patient" who might be having "chest pain" that "one last drunk" because you have dealt with them the entire night. But our job is to make sure everyone is safe. If we don't provide the appropriate care to a patient, and that patient dies, we would be in the same boat as these officers not taking care of an undocumented immigrant, driving illegally, and intoxicated that was just involved in a traffic collision.
Also, why didn't they think to call a medic?? I think in general they should have been able to have them transport to the hospital... EVEN if they were in protective custody and then released them there. I know hindsight is 20/20 and we all make bad choices in our career... But in my honest opinion, from the dash cam footage, this should and could have been avoided.