That's exactly how I'm reading it.
Being a funeral, the situation was always going to be emotionally charged - taking on those doing the burnouts could've ended up being very ugly.
The police blocked off the road - yeah sure, for the safety of the other motorists, that wasn't a green light for them to do what they did. I don't know a single cop that would intentionally block a public road and allow a burnout comp on it.
It's one thing to give it a go as you're leaving, it's another thing entirely to do standstills for an hour. It's selfish and it's disrespectful. Imagine if you were there visiting a loved one's grave, or even worse, having a funeral while all that crap was going on? This wasn't about giving someone a send-off, this was about using someone's death as an excuse to engage in a pissing contest.
I know if I was the funeral house, I'd be asking plenty of questions at future funerals if the deceased was a young male. Some of those marks look like they'll be there till the next millennium - not a good advertisement.