If people actually believed that then they are fools. People read what it said on the bus but didn’t read it properly as is quite usual in this day and age.
So what you are saying, the people who
1 Read the big red bus:
2 Believed what was said on the big red bus:
3 Listened to the Politicians, who repeated what was said on the big red bus and believed them:
4 Voted for Brexit because they felt that the message on the red bus was fact:
Were in fact FOOLS, aka STUPID!
And I thought people who voted for Brexit were not to be called STUPID.
I wonder how many other Brexit statements were not true, or did the fools just not understand them?