What the fusion research community has instead is people who have committed their careers or even lives to a particular field. Getting them to admit they made a mistake is very hard. What did Upton Sinclair say? "It is difficult to get a man to understand something, when his salary depends on his not understanding it." Most of them will rationalize as hard as they can for as long as they can.

You sometimes see bitter comments when they are approaching or are in retirement.