The government claims they want to lower the limit to save lives and protect us from ourselves, but their true agenda has always been zero tolerance and Big Brother controlling yet another aspect of our lives.
Don't forget the amount of money the gov makes off of the people that are caught. The court costs, fines, insurance premiums, license fees, etc.
Let's not fool ourselves into thinking that the same gov that builds billion-dollar weapons to kill people thousand of miles away really gives a s*** about saving a few people on the highway. Its about money, everything is.
Lower limits = higher likelihood of more offenders, its that simple.