I hear what you are saying, but after an incident or two, I'd be pretty much doing the same, putting up a protective barrier of some sort. Maybe I'd ask the local government to put up a sign, maybe not. Allowing someone to crash through your home just doesn't make sense. People have to drive safely or bear the consequences. It's that personal responsibility thing.
There's a house nearby me on a curve of the road. They have put up a sturdy low barrier fence and 35 reflectors at staggered heights to warn people. I'm sure that was put up to avoid car/home crashes. Personally I wouldn't live at that house, but maybe they bought the home when people drove sedately through neighborhoods and weren't looking at their cell phones. But times changed. So they put up a barrier. I would have too
Depending on the barrier, that may well be a rather different kettle of fish to a big ton rock, though.
Don't get me wrong, I'm not saying people should bend over backwards and/or put their home or their families at risk, just to ensure reckless drivers can avoid any consequences of their actions.
But we're
all responsible for the consequences of our actions, not just reckless drivers, and choosing,
intentionally, to create a barrier (in this case, an immovable massive rock) that is much more likely to lead to life-changing (or even life-ending) consequences for the driver, seems to me to be a form of negligence that is even less justifiable than reckless driving.
Like I said, even in the States, non-intentional reckless driving isn't generally punished with the death penalty.
Then there's the plain fact that it would be a risky assumption that
any crash that might occur, would
always be due to negligent recklessness. There's always momentary incompetence, or momentary distraction, even mechanical failure.
Even if a given crash was due to negligent driving, living with a decision that one had made, that had contributed to the death or permanent disablement to someone would, for me at least, be a tough burden to carry.
Who knows, maybe that person had always previously been a considerate, sensible driver, but was acting out of character due to some seriously traumatising life event?
Okay, we're into ifs and buts here, but risk is not just made up of one factor; the probability is one factor sure, but there's also the severity of the outcome.
I dread to think how I would feel, if it was a passenger who was permanently disabled or killed.
I'm definitely not saying nothing should be done, but given the OP has at least some time to reflect and work out something that might lead to less risk for the inhabitants of the vehicle (driver
and passengers; the latter likely not being culpable for any crash), I'd argue
they have the responsibility to find a solution that
won't potentially kill or permanently disable.
I'm not completely some bleeding heart softie (for example, I do have
some sympathy for the "
when seconds count, the police are minutes away" argument that gun owners in the US offer for owning firearms for protecting their families), but the OP's idea seems to me to be a bad, potentially disproportionate solution, born out of understandable frustration, not out of the calm, considered problem solving that the OP has the time to do.