system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5:Why is it so important to break up the biggest banks?
gpt
One reason is that you have banks that are "too big to fail." We bailed out the big banks in 2008 because allowing them to collapse would have been even costlier to the economy.

The worry is that the precedent set in 2008 incentivizes the banks to engage in more risky behavior since they can be confident that if there is a collapse the government will bail them out again. By splitting them up, it ensures that one bank going under isn't so disastrous for the economy and there won't have to be another bailout.