BMW is being sued because they have deep pockets. End of story. Lawyers are just chasing cash, and the class action scam is one of their favorite ones to run. No different than Apple, samsung or any other big company. Lawsuits are part of the territory.
Do not misunderstand, the HPFP is certainly a stain on their resume. It is not enough to make anyone that loves driving buy an Audi etc. instead.
Sometimes the thing that makes you appreciate the BMW driving experience most is driving a non-BMW.