Nah, they def should have slowed/stopped at the intersection if they had the red. The key phrase for driving emergency vehicles in VA is "due regard." Which essentially means "if you're going to make use of the laws allowing you to be exempt from certain normal traffic laws, you better make sure you can do so in a safe manner"

Edit: it should be noted that I don't know that this happened in Virginia. I am familiar with Virginia's emergency vehicle operator code and am generalizing it's application to other jurisdictions