Final answer:
The speaker criticizes others for being foolish.
Step-by-step explanation:
The speaker criticizes others for being foolish. The phrase 'Fools! Fools!' suggests that the speaker is expressing frustration or disbelief at the lack of awareness or understanding of others. By asking if they see what is written on the side of the van, the speaker implies that others are unaware or oblivious to something that is clearly visible to them. This indicates criticism towards others' lack of intelligence or perception.