I agree completely with your first sentence. As for your second sentence, I think its a reasonable rhetorical position to take for the sake of pulling the debate in the correct direction, but that there's a compromise that could be made. Essential systems should definitely not be running off the same computer that's running relatively complex and crash-susceptible stuff on a general-purpose software stack (e.g. the infotainment system running on Linux), but I think it's probably okay to consolidate them on a single computer running a hard real-time OS and simple software that's open source and auditable by third-parties, including the NHTSA (edit after noticing what community I'm in: or whatever its European equivalent is).