First of all, a felony stop is not used any time a felony is suspectd. It is supposed to be used in only cases where the public or the officers are likely to be in imminent danger.
The lead officer in a case like this is supposed to observe the vehicle and occupants, then make a determination of what type situation he is facing.
If the car has been pursued at high speed with shots fired at the officers etc. then the type action which was used would be justified.
If the occupants look to be a bunch of gang bangers, and there is real evidence of a serious crime, weapons are spotted or the occupants are acting suspiciously, then they still would be justified in aggressive conduct.
On the other hand if the suspects appear to be a family on a trip, which is what this had to have looked like, then the cops take a totally different type action. Of course they still are careful, but any rational person, not just any trained law enforcement officer could see this was about as innocent looking carload as would be possible to imagine.
Yes cops are supposed to use judgement, make that good judgement. In this case their actions did not even rise to the level of bad judgement.