Reasoning pattern · source evaluation

Motivated source rejection

Motivated source rejection applies inconsistent evidentiary standards to sources according to whether their conclusions fit a preferred belief, rather than evaluating what each source can actually establish.

Also known as: selective distrust

Source incentives and conflicts matter, but they do not make evidence automatically false. A better approach is to inspect methods, data, replication and independent corroboration while applying the same skepticism to congenial and uncongenial sources.

In practice

Claims using this reasoning pattern

Contradicted Reviewed Sep 30, 2026

Do vaccines cause autism?

The vaccine-autism claim has been tested in large cohort studies, case-control studies, meta-analyses and evidence reviews. A 2019 Danish cohort of 657,461 children found no increased autism risk after MMR vaccination, including among children with elevated baseline risk, and a 2014 meta-analysis covering more than 1.2 million children found no association with vaccination, MMR, thimerosal or mercury exposure from vaccines. The 1998 paper that catalyzed the MMR claim was a 12-child case series, did not establish causation and was later retracted.

health medicine

Unsupported Reviewed Sep 30, 2026

Did modern electronics come from recovered alien technology?

The best-known version of this claim comes from Philip J. Corso's 1997 memoir The Day After Roswell. The technologies he linked to recovered alien hardware have extensive, independently documented scientific and engineering lineages: semiconductor research led to the transistor in 1947, the integrated circuit followed from transistor and planar-process work in the late 1950s, lasers grew from maser and stimulated-emission research, and practical optical-fiber communication emerged from documented work on low-loss glass. No independently verifiable artifact, laboratory record or technical transfer chain has established an extraterrestrial origin for those technologies.

conspiracy theories technology radiation

Unsupported Reviewed Sep 30, 2026

Are vaccination programs designed to make children chronically ill for later profit?

Vaccines can cause adverse events, including some rare serious events, and vaccine safety evidence has real limitations that require continued surveillance. Those facts do not establish an intentional program to create chronic disease. A 2013 National Academies review found no evidence that the then-current U.S. childhood schedule was unsafe while also identifying research gaps; post-licensure systems such as VAERS and VSD are designed to detect and investigate safety signals. Neither that historical schedule review nor the surveillance systems prove every vaccine policy optimal, but no verified documentary, epidemiological or mechanistic evidence establishes the claimed design-for-chronic-illness scheme.

health medicine conspiracy theories

Misleading Reviewed Sep 29, 2026

Does fluoride calcify the pineal gland and suppress cognition?

A small 2001 study of 11 aged cadavers found substantial fluoride in pineal tissue and a positive correlation between pineal fluoride and calcium, so claims that fluoride can occur in calcified pineal tissue have a real empirical basis. The study did not show that fluoride caused pineal calcification, impaired pineal function or reduced cognition. Separately, current systematic reviews report an association between higher fluoride exposure and lower childhood IQ, while evidence at drinking-water concentrations relevant to 0.7 mg/L community fluoridation remains limited and disputed. Neither line of evidence establishes a pineal-mediated cognitive effect or an intentional population-control program.

health medicine conspiracy theories