In this particular case, the public legal establishment seems quite supportive of the good samaritan... Seems that he wasn't charged with anything and was released after questioning... I wouldn't say he's the "focus of a criminal investigation" on the part of the authorities.
But private lawyers are another story... Some will try to get $ wherever they can... And the courts have to suffer them to some degree... Sometimes, it's a pity... But it's America... All sides tend to be heard for better or for worse...
IF THE SHOE FITS, WEAR IT!... IF THE GUN FITS, SHOOT IT!