Why do Dev tools offer Quirks mode?

Question

I am wondering if anyone has a reason why web development plugins for browsers offer buttons for displaying content in quirks mode?

Are there people there that markup for the quirks mode specifically? What is the point of seeing how the site will be displayed in quirks mode when the markup already has a document type?

Am I missing something, or is it my suspicion that there was a bit of wasted time here, can I add the great guys and the guys who took these tools together?

Cheers, Steve

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EDIT: I just want to make it clear that this is a serious question. I do not want to be smart. I am seriously worried that I missed something.

Answer 1

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Answer 2

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Answer 3

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Answer 4

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Answer 5

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Answer 6

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Having this option will show you what happens if, for some reason, the DocType switch fails.