"Like a dog!" he said, it was as if the shame of it should outlive him. — Franz Kafka

They're talking about things of which they don't have the slightest understanding, anyway. It's only because of their stupidity that they're able to be so sure of themselves.

'...it is not necessary to accept everything as true, one must only accept it as necessary.' 'A melancholy conclusion,' said K. 'It turns lying into a universal principle.In the Cathedral

It would have been so pointless to kill himself that, even if he had wanted to, the pointlessness would have made him unable.