If you're actually following the stats you will see that vehicle size only accounted for 10% of the increase. You would want to focus on the other 90% to make the biggest difference. And using that logic, you should increase the education and testing requirements for all drivers because that will provide gains over the whole driving population instead of a single segment.
Penalties should remain the same for whatever the outcome is - doesn't matter if a bicyclist kills me or a semi truck.
Lower BAC limits are opposed even by groups like MADD. The data shows the current level is good and lowering it further will result in more people ignoring it.
Nobody is asking you to pay for others' decisions (unless we want to go down the rabbit hole of insurance, for which sports cars and high priced electrics are costing all drivers more). Nor is a large vehicle an infringement on anyone's right to life (someone's recklessness could be).