1. If you're speaking just because you can and you have the platform, and nothing more, how then does collective action arise?

Since a human depends on others for survival it can't be that speech is just a decoration and has no importance in survival.

2. The basis of the law can't be individual opinion. If it were so, then it would never be the law. It would be mere opinion.

Again, even if someone told you 'kill me'. What conditions would have to be met to ensure that in fact there was consent?

How about the instance of what we may call 'constructive duress'? It may happen in the battlefield in the case of soldiers. War is intense and the emotional weight of going to battle is harrowing. The soldier may give up easily even with a non fatal wound.

3. It must be an objective fact that humans should always act in the best way to preserve themselves. Action to the contrary is deemed immoral. Otherwise we'd never talk of crime.

4. Therefore the main use of speech is to generate knowledge that will sustain survival. Being.