Thinking Americans ?

That is what the left is trying to create. Robots who are all required to think the same and who automatically attack and try to ruin/cancel those who don't comply.

And truthseeker is one of those robots. Hiding behind a name that is truly the opposite.

Yup! Groupthink is real, practiced, and evident on the Democrat Left. They don't think. They cooperate. 

Groupthink Symptoms

Symptoms

To make groupthink testable, Irving Janis devised eight symptoms indicative of groupthink:[21]

Type I: Overestimations of the group — its power and morality

Illusions of invulnerability creating excessive optimism and encouraging risk taking.

Unquestioned belief in the morality of the group, causing members to ignore the consequences of their actions.

Type II: Closed-mindedness

Rationalizing warnings that might challenge the group's assumptions.

Stereotyping those who are opposed to the group as weak, evil, biased, spiteful, impotent, or stupid.

Type III: Pressures toward uniformity

Self-censorship of ideas that deviate from the apparent group consensus.

Illusions of unanimity among group members, silence is viewed as agreement.

Direct pressure to conform placed on any member who questions the group, couched in terms of "disloyalty"

Mindguards— self-appointed members who shield the group from dissenting information.

https://en.wikipedia.org/wiki/Groupthink#Symptoms

I understand that Marxists don't believe in human suffering, and they think that what they do is moral; good; justified, virtuous. I think they need convincing before they see what they are supporting is all about human suffering. Convince them of it.

The opposite is true. 

all the great thinking Americans are on this forum...lol