What causes absence of mesomeric interaction in benzoic acids?

[Vectorcrust]

Why there is no mesomeric interaction between $\pi$-electrons of aromatic ring and $\pi$-electrons of carbonyl group in benzoic acids?

 

[chemisttree]

I would think it was because the positive charge was bourne fully by the dissociated proton rather than the carbonyl carbon attached to the aromatic ring.

 

[asym]

There are no valid resonance structures satisfying the octet rule.