Oddly Wired
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persuasion

Asking why makes you more stubborn than asking how.

A 2013 study found that asking someone to explain 'why' they hold a position strengthens their opposition.

When forced to justify 'why', people double down on their emotional commitment. Asking 'how' a plan would work forces them to realize the practical gaps in their own logic.

You talk people into deeper trenches by asking for their reasons.

Where this comes from

Study
Fernbach et al., 2013, Psychological Science
What the check found
The claim accurately reflects the findings of Fernbach et al. (2013) regarding the distinction between mechanistic 'how' explanations and reason-based 'why' explanations.
Confidence
Well replicated

Related

One of these every day, and every one names the study it came from. When a finding is contested, it says so.