Any articles? I couldn't seem to find anything other than this one that says crashes are reduced by 38%, but there were no cost figures.
That said, I don't think it's a buggy-whip problem: 14B Euro per year might be correct, but I don't think it's a win for society in monetary terms - I'd question the assertion that the return on investment is greater than one.
For example, the mandate in the US for rear back-up camera costs society about $25 million per life saved, because it's a couple hundred bucks times several million cars, to save only a couple hundred lives - which is on the order of billions. Given US GDP per-capita is only about $53k, society is losing money there - 80 years times $53k is only about $4.25M, so society is paying at least 5 times the average monetary value of a life* to save one. Now I used something close to life expectancy; it's worse if you only consider working-age years (which is what, 50 years or so?).
It is indeed sad when accidents cost lives, but we passed the point in vehicle safety where the incremental cost of accidents avoided exceeds the losses of the accidents themselves (in aggregate of course - there may be individual accidents which cost more).
*It's sadly harsh, but society has to think of things on economic cost at this scale. Put another way: nobody sensible would pay $100 for an insurance policy that only pays out $20, but that's kind of what mandated automobile safety features does these days.