conventionalismagainst

the hitler problem

1. If Conventionalism is true, then what Hitler said was true.

2. What Hitler said wasn’t true.3. [So] Conventionalism isn’t true.

the progress problem

1. If Conventionalism is true, then what MLK jr. said was false.

2. What MLK jr. said wasn’t false. 3. [So] Conventionalism isn’t true.

the poll problem

1. If Conventionalism is true, an accurate public opinion poll is a perfect guide to morality.

2. A public opinion poll isn’t a perfect guide to morality, even if it’s accurate.

3. [So] Conventionalism isn’t true.