A great way to increase your liability in an automated fashion!

Sure, the code on Stack Overflow is licensed as MIT... but what assurance is there that the code which was posted is original property that the poster owns copyright to? What assurance is there that the posters won't claim patents on the methods being used?

The risk is low, but it's certainly not 0. Big companies caution their software developers to not even read code in SO answers to avoid lawsuits... how much risk do you bring to your company by copying and pasting (not to mention autocompleting) from SO?

I am not a lawyer, etc. etc.