Explain that since copies of the information are kept by different people it's really hard to censor a blockchain. We need to be able to trust that the news we read are not edited a year later, even our own words can be edited or deleted. So truth, outside a blockchain, can be manipulated and it is. That to me is the biggest pro for this technology. On Steemit, for example, even if people don't like one of my post and start flagging it they simply can't delete it. They can hide it, have it grayed out, if enough people vote negatively I won't be making money for that post. But they can never delete my words and that's a relief.