The fact is, there are people that do not stop drinking. Lack of will power, moral fiber, addiction, genetic cause, or whatever the reason may be, they only stop when they're dead. Some of the best intentioned people when sober, will experience black outs at which point aren't in control of their actions, anything short of physically restraining them is ineffective.
By the time someone is on their 4th arrest( and that means they have endangered the public how many times and not been caught?) isn't it society's responsibility to protect itself from their actions?