Is it fair to treat some offenders informally?

Yes, it is. Realistically, you should treat no offenders formally, but that's your choice.

1)harmony-a2)balance-e3)asymmetrical balance-b4)abstract-c5)approximate symmetry-d

Generally spontaneous human combustion is something that still bewilders some, human combustion happens very rarely and doesn't affect the surrounding areas, so unless you want to set your self on fire, human combustion will remain spontaneous and very rare.