Too much polarisation results in a shrinking middle ground and the growth of alienation, bitterness and recrimination.
But it is forgotten that eugenics was originally a doctrine of the Left who believed in what might be described as a perversion of liberalism.
Children who grow up in welfare-dependent families are much more likely to be dependent upon welfare as adults. This is the unsurprising finding of Professor Deborah Cobb-Clark in the Youth in Focus research project.
If the runes of popular culture are anything to go by, marriage is far from a moribund institution. Yet creating something called Divorce Day arguably trivialises family breakup.
Once, keeping everything the same made people feel comfortable. Now we've become the disruption generation, accommodating disruption in deeply personal ways.
The Department of Veteran's Affairs announced last March that the centenary of the Battle of Broken Hill on 1 January 2014 would not be formally commemorated by the Australian Government.
The idea seems to be that children are no longer a social good and to be supported by the community, but a private indulgence for those who can 'afford' them.
If a person's sole source of income is the taxpayer, the person, as a condition of benefit, must have contraception. No contraception, no benefit.
In the end, the violence committed by Man Haron Monis did not inspire communal hatred, but brought us together.
Take people, for instance. It is not unreasonable to be influenced by the first impression their appearance gives, and which often categorises them into a genre.
While particular aspects of the Monis case are a matter for investigation, the whole experience suggests that the pendulum has swung too far in the direction of 'compassion' and away from realism and national interest.
Now consider the unmediated demonstration of communion driving the 'I'll ride with you' hashtag.