[bgill]

but the motive of the driver aren't clear

Sticking to the meme.

Driver = isn't. Aren't = multiple people. Which is it?

[Bigg Red]

but the motive of the driver aren’t clear

***
I assume that the moron writing the piece meant to say
“but the motives of the driver aren’t clear”.

The agreement in number would be dependent upon the noun “motives” and not “driver”.