Type-1 flags are more subjective. If you believe:
 - Anyone dealing with the user is at a high risk of losing money, due to red flags which any knowledgeable & reasonable forum user should agree with, and not just due to the user's opinions.
 - Enough of the above-mentioned factors are listed in the linked topic.
 
Then you can support it. If you believe the first but not the second, then you should oppose it and create a separate flag. If you believe that the first is incorrect (ie. people dealing with the user are not at a particularly high risk of losing money), then you should oppose it.

The type-1 flags on Quickseller, BSV, etc. aren't misuse of the system by either supporters or opponents.