Well, to reduce the size of the government, you need to establish individual responsibility. You need to let people know they're in charge of their lives. If we let the Liberals get them addicted to drugs and pornography, they will not want to be in charge. They'll say: "You are bad because you 'force' me to work to make a living. Why can't you just give me my dole so I can buy my cocaine and watch my porn all day?" You see, Big Government advocates use drugs and pornography to get irrational and semi-rational people to support them.
Also, by letting people commit suicide and find substitues for marriage, we remove their motivation to reproduce. This would be absolutely fine with me if rationality were genetically determined: the irrational people would become extinct in just a couple of generations.
The fact that there are so many irrational people around today is proof that rationality is not genetically determined. Thus, rational parents may have irrational children, and vice versa. By removing the motivation to reproduce, we punish the future generation for the irrationality of their parents.