Bias: Is / Must / Should / Can

[I]t’s really this simple, isn’t it?

CAN: progressive (short) [consumption] [development of offspring]
SHOULD: libertarian (med) [production] [competition of production]
MUST: conservative (long) [saving] [competition of the tribe]
IS: science. (Timeless) [existence] [stock of knowledge]

Source: (1) Curt Doolittle