I would like to talk about a rhetorical device called "the slippery slope." The Wikipeda has an interesting article about this device here. The argument goes like this:
If A occurs then the chances increase that B will occur. (quoted from the article mentioned above)
This movement toward B is usually assumed to be a negative one, thus the analogy of sliding down a slope. The problem is that even if A often leads to B, this does not mean that B is inevitable. When confronted with a slippery slope argument we should question the connections that are implied. Does A really lead to B? A good sign that a slippery slope argument is fallacious is when the invoker is actually saying something like this:
If A occurs then the chances increase that A1 will occur and if A1 occurs then the chances increase that A2 will occur and if A2 occurs then the chances increase that A3 will occur and if A3 occurs then the chances increase that B will occur.
In other words, the connection between A and B is not actually that close. It is only through a long series of circumstances that A might cause B.
I should point out that slippery slope rhetoric is not always fallacious. It can actually be a valid point that A increases the chances of B. What I don't appreciate is when the slippery slope mentality is used as a scare tactic. One of the books that I really resonated with early on in my move away from fundamentalism is The Post-Evangelical by Dave Tomlinson. One of the things he talks about is the way some people try to frighten others by suggesting that they are becoming "liberal."
"If you carry on talking like that," one well-known speaker was chided by a leading evangelical, "people are going to think you've gone liberal, and before long, you'll find that you won't be seen as fully evangelical, and then doors are going to close, and then..." (p.61)
Tomlinson compares this kind of argument to parents telling their children that the "bogey-man" will get them if they don't do such and such. This kind of argumentation frustrates me because if something is true, then it's true. If I believe A to be true, I can't change my mind just because it might lead me to believe B.
Let me end with two important caveats:
- I'm not saying one should not consider the consequences of what one believes.
- I'm not saying we should assume those who invoke the slippery slope are purposely using it as a scare tactic.
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