If you find a contradiction in someone's logic, will finding the contradiction cause logical errors in their subsequent reasoning?

My former Mistress and I were discussing economic policies one time after a good flogging, and she argued that increasing government spending would necessarily lead to a decrease in unemployment, asserting that more public projects would create jobs for everyone.

I pointed out a contradiction in her logic by reminding her that increased spending could also lead to inflation, offsetting the job gains and causing other economic issues. Initially, she dismissed me with her usual hand wave, but as we delved deeper into the topic, it became clear that her initial assumption was overly simplistic.

I guess this realization forced her to reconsider her stance and acknowledge the interconnectedness of various economic factors. Then her subsequent arguments about fiscal policies became more nuanced, but she initially struggled to adjust her reasoning. Like, she inadvertently proposed tax cuts alongside increased spending, failing to recognize the implications on the national debt.

If you find a contradiction in someone's logic, will finding the contradiction cause logical errors in their subsequent reasoning?
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