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A Circumstantial ad Hominem is a fallacy in which one attempts to
attack a claim by asserting that the person making the claim is making
it simply out of self interest. In some cases, this fallacy involves
substituting an attack on a person's circumstances (such as the person's
religion, political affiliation, ethnic background, etc.). The fallacy
has the following forms:
Person A makes claim X.
Person B asserts that A makes claim X because it is in A's interest to claim X.
Therefore claim X is false.
Person A makes claim X.
Person B makes an attack on A's circumstances.
Therefore X is false.
A Circumstantial ad Hominem is a fallacy because a person's interests
and circumstances have no bearing on the truth or falsity of the claim
being made. While a person's interests will provide them with motives to
support certain claims, the claims stand or fall on their own. It is
also the case that a person's circumstances (religion, political
affiliation, etc.) do not affect the truth or falsity of the claim. This
is made quite clear by the following example: "Bill claims that
1+1=2. But he is a Republican, so his claim is false."
There are times when it is prudent to suspicious of a person's
claims, such as when it is evident that the claims are being biased by
the person's interests. For example, if a tobacco company
representative claims that tobacco does not cause cancer, it would be
prudent to not simply accept the claim. This is because the person has a
motivation to make the claim, whether it is true or not. However, the
mere fact that the person has a motivation to make the claim does not
make it false. For example, suppose a parent tells her son that
sticking a fork in a light socket would be dangerous. Simply because she
has a motivation to say this obviously does not make her claim false.
"She asserts that we need more military spending, but that
is false, since she is only saying it because she is a Republican."
"I think that we should reject what Father Jones has to say
about the ethical issues of abortion because he is a Catholic priest.
After all, Father Jones is required to hold such views."
"Of course the Senator from Maine opposes a reduction in
naval spending. After all, Bath Ironworks, which produces warships, is
in Maine."
"Bill claims that tax breaks for corporations increases
development. Of course, Bill is the CEO of a corporation."
