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So I've got the following:
"You're either with us, or against us," so you're XXX or XXX-minded
"You have black-and-white thinking," so "You have XXX thinking"
and "The people who support a philosophy such as this one, have a mindset of all-or-nothing."
Please illuminate me, I just feel like there's an encompassing term.
absolutist
ab·so·lut·ist
- noun
1. a person who holds absolute principles in political, philosophical, or theological matters.
"he was a moral absolutist with little patience for shades of gray"
- adjective
1. relating to or supporting absolute principles.
"an absolutist political tradition"
The 'ideal' is a fallacy called false dilemma or false dichotomy.
A false dilemma (also called false dichotomy, false binary, black-and-white thinking, bifurcation, denying a conjunct, the either–or fallacy, fallacy of exhaustive hypotheses, fallacy of the excluded middle, the fallacy of false choice, or the fallacy of the false alternative[citation needed]) is a type of informal fallacy in which something is falsely claimed to be an either-or situation, when in fact there is at least one additional option.
(Wikipedia)
In psychology, the term is splitting:
Splitting (also called black-and-white thinking or all-or-nothing thinking) is the failure in a person's thinking to bring together the dichotomy of both positive and negative qualities of the self and others into a cohesive, realistic whole. It is a common defense mechanism used by many people.1 The individual tends to think in extremes (i.e., an individual's actions and motivations are all good or all bad with no middle ground).
