It's not that they don't care about us, it's that they don't "see" us.
No matter how big our bikes are (full dress Harley) we are smaller than the smallest car. Sometimes they don't see cars either. How many insurance reports state the driver never saw the other vehicle? Lots.
It truly sucks that there are so many oblivious people out there, but there are. And they will kill you if you expect them to see you. Sometimes they even run into trees. They really didn't mean to, they didn't do it on purpose you know, but you will be just as dead as if they did.
Yup, always prepare to be invisible -