Sure, that's true, but i'm asking you what you think about a specific scenario.
Let me make it even more relevant.
If someone pushed another dude directly into magma, you think it was all the magma's doing yes? The person who pushed the other individual into the magma didn't kill them, only the magma did, so they should receive no punishment, right? They didn't kill them, the magma did. Is this what you believe? Yes or no.
Let me make it even more relevant.
If someone pushed another dude directly into magma, you think it was all the magma's doing yes? The person who pushed the other individual into the magma didn't kill them, only the magma did, so they should receive no punishment, right? They didn't kill them, the magma did. Is this what you believe? Yes or no.
Yes, they should be punished. That doesn't change the fact, if Kaido is dead, it's because of the magma not Luffy's punch. Luffy himself doesn't have the power to kill Kaido he needs outside source to do the work for him.