1.) Assumption: Objects and events affect our thoughts and beliefs. The determinist believes this, because it must be an object or event which determines thought. The non-determinist also believes this, because to think about something is to be influenced by it. Thus, everyone accepts that there is some influence over our thoughts on the part of external factors (debate being over its degree).
2.) Either your thoughts are deterministic, or not. (Excluded middle)*
3.) Plantinga has argued against thought determinism -- in that one cannot claim to have arrived at this belief through reasoning.† If determinism is true, you can't be correct about it (in contrast to being wrong about it) -- you are merely 'caught up in a particular causal stream.'
∴ If you believe in absolute determinism, there is no sense arguing. You might still argue (you would be fated to do so), but there is no sense in it.
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