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I wondered why more FOSS projects aren't using CC0 instead of "permissive" licenses like MIT, considering a lot of folks who work in FOSS are against copyright/software patents system in general, and most of them don't really seem to care about attribution.

People who release code under MIT not only won't/can't take legal action but they probably won't even bother writing an email to the person who they believe violated the attribution part.

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Because permissive licenses promote proprietary use cases and that's not what FOSS movement aims to achieve.

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MIT doesn't promote proprietary use cases any more than CC0.

I do (somewhat but not really) get why people use GPL but that's another story. Here we are only talking about people who use MIT instead of CC0.