Lol, you couldn't make this stuff up. Blockchains are about the disintermediation of trust and the most important thing you learned from the expo is that trust is important...
Its not what i make up. They say and have experienced that there is a need for a Blockchain to be trusted. Yes, that sounds weird indeed.
But the fact is that if i was a business and want to store -sensitive- data in a blockchain which is not controlled/created by myself, i would need to do my due diligence as to get a feeling for security and in the end trust the chain i'm going to work in and trust my data to. In that light i can understand the reasoning.
Maybe it's because the technology is still in its infancy / beta or people just don't understand it at all. Would you just give your private data to someone?