he blamed it on the response from law enforcement "a public saftey issue"...
Well, to be fair, most of the LEO's I'm friends with and know are also against open carry and think it's a bad idea for the state. They're all for conceal carry, however. I think even Mike Brown may have said on a thread here that he thinks open carry is a bad idea, not necessarily against it, but just thinks it's a bad idea.
I've met and spoken with Brad a couple of times. He's a reasonable guy and if he honestly did speak with LEO's regarding open carry and they stated their opinions that open carry is a bad idea similarly to the LEO's I know have responded, then his veto should come as no surprise.
As a governor, he must rely on the advise of others when it comes to policy, especially on policy that he may not be 100% familiar with. If he's not a conceal carry holder or knowledgeable in firearms, then it makes sense for him to defer to the opinions of LEO that he may have consulted.
He's a democrat, so obviously he tends to lean a bit on the left on policy and when it comes to firearms. However, you can't say that a conservative politician that doesn't conceal carry wouldn't have also veto'd the bill if LEO's had advised against the measure. It may have taken stronger arguments against open carry, but it would and could still happen.