I think it's both. Increase times and also enforce red-light cameras --but within reason. Where I live, at some intersections there aren't always dedicated LH turn lanes, so people have to wait till oncoming traffic has a large enough gap to make the left. Often times, the only time left to make the left is to wait for the yellow... and the 3 or four cars behind have an option of going through a red light or waiting again for a yield on green... In this situation, people have little option but going through a red (or possibly taking a more circuitous route).
That said, for the most part, I feel red light cameras are a racket.
That said, for the most part, I feel red light cameras are a racket.