The actual cause of failure I believe is when the suspension is over compressed and causes the top of spindle and upper control arm to push upwards and come into contact with the top of the inner fender.
A good sized pothole would do it, and actually softer suspension is probably more likely to allow a contact vs a stiff suspension.
The SPC control arms may have been a contributor, they are steel and have no give, and the upper ball joint they use reduces the upper clearance slightly vs stock. With stock upper arms you might bend the upper control arm instead, not sure.
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