Andrea's speech was incredibly moving, so much so that even he was touched by it. However, it was futile; most of the audience consisted of common folk whose thoughts were not so grandiose, and who instead placed a higher value on immediate interests.
They say when the number of people doubled, their collective intelligence is halved, and there were far more than a thousand people outside. Those in the front could hear Andrea's speech clearly, but as it reached those in the back, it inevitably suffered from selective quoting and creative editing.
Looking at the chaotic crowd, Andrea reluctantly admitted: preaching reason was impossible now.
Unless he had the energy to work on persuading each person individually with his persuasive tongue, perhaps he could convince everyone. Obviously, that was impossible; the crowd outside was too large, he couldn't possibly manage it all.