by ohthatpatrick Fri Feb 15, 2019 3:44 pm
Well, most importantly, the anti-conclusion is a tool / process / mindset for helping us to conjure up objections.
It's not a failsafe way to do every LR problem in the assumption family. For example, I would almost never use the anti-conclusion on a Sufficient Assumption or Principle-Justify question.
The anti-conclusion mindset is the same as "opposing counsel" mindset. You're just thinking, "If I'm the other lawyer, tasked with creating doubt about whether the conclusion is really true, what could I do / say?"
One move defense attorneys have is to undermine the credibility / expertise / relevance of the prosecution's witnesses or evidence.
Let's say the prosecution is saying, "Clearly, Mr. Jones is in good mental health. We administered a mental health test yesterday and he got a perfect score."
If we found out that 100% of people pass this mental health test (maybe it's a two question test that goes "1. Are you mentally healthy? 2. Are you sure?"), then the judge/jury will no longer find Mr. Jones's perfect score to be compelling testimony.
Thus, we've weakened the prosecution's case.
That's all we're thinking when we Weaken or Strengthen by assessing the credibility / expertise / relevance of a piece of evidence.
Another example:
"Mr. Jones is clearly in the same financial position this year as he was last year. After all, his responses to this financial questionnaire are the same as those of last year's identical questionnaire"
If we find out that the financial questionnaire only asks about Wages, but fails to ask about stocks, bonds, capital gain, gambling losses, expenses, etc., then we wouldn't trust this questionnaire to give us a full picture of Mr. Jones's current financial position.
That's all that's happening here with (A).
We could still use the Anti-conclusion here, but try not to get too rigidly affixed towards getting positive evidence in favor of the anti-conclusion.
Weakening an argument is just like weakening the prosecution's case:
- you can do so by producing new evidence of your own that seems to possibility outweigh the existing evidence
or
- you can attack the evidence already presented, and argue that it's not relevant / compelling / trustworthy in some way.
GIVEN THAT
these studies suggest that short-term psych clients show similar levels of improvement regardless of type of therapy
HOW COULD WE ARGUE THAT
some improvements in short-term psych are NOT common to all types of therapy
(A) we could say that these studies only measured a narrow range of improvement, so they failed to capture some important forms of improvement that result from certain types of treatment but not from others.
Hope this helps.