Some sides/arguments are just so poor that they don't deserve much more than a mental consideration (they don't deserve to be mentioned in a 'debate'). Not all arguments are created equal and the actual truth doesn't necessarily mean it is in the middle of the 2 sides.
Something else that you seem to do is that I get the idea that you think the other person(s) haven't considered a certain aspect of their argument and then you try to show the shallowness of what they said but end up underestimating the extent to which their side is backed up. I will give an example that is only slightly on topic. If you were debating someone on evolution you would think that they haven't properly thought of the other sides arguments so you bring up irreducible complexity thinking it is something they haven't considered. The problem is that the person defending evolution already knows about I.C and knows of the several ways that I.C fails to weaken the position of evolution. It's like you think step 2 in thinking stumps them when there are still steps 3 and 4 which go even deeper. This seemed to be the case when talking about the 'odds' or something like that of the universe existing.
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