There are other options. Decapitation and hanging are old fashioned methods that we used use in Europe before we become civilised. They are painful, but not as painful as this, and they are cheap and don't require any special drugs. Yet the alternative American method seems to be the electric chair! Again it's expensive, complicated, painful.
Americans seem to be the sort of people who if you gave them a free copy of Mac OS X that would run on any hardware they would decide to buy Windows 8 instead.
Obviously I am drastically over-simplifying the legal issues here.