People die every day because another driver is going unsafe speeds on the road, but despite what all those deaths add up to it's only in the most extreme cases of reckless driving is anything more then a ticket given.
I agree with the sentiment that this is a behavior is one that should be curbed for countless good reasons. This though is clearly a case where an arrest is completely inappropriate. A citation would likely have stopped the offender with a net gain for law enforcement rather then the cost of an arrest and the fighting and bad publicity that this is going to lead to.
Stopping the unwanted activity at a net gain to the tax payer seems like a much better deal to me.