The SUV the guards shot was recorded driving through the park.
Many reports said shots were fired from that vehicle. They didn't find any guns so probably not. Internet detectives decided the shots were fired from a different SUV recorded speeding away afterward. But it was actually recorded speeding toward the area. And people feared getting rammed not just shot.
They were protesting police brutality against peaceful or restrained black people. That isn't exactly like an oncoming SUV.
[1] https://www.usatoday.com/story/news/nation/2020/07/08/vehicl...
I would want to know why the police didn't set up a safer perimeter or have spike strips. They have resources volunteers don't. But they have a moral duty to protect other people when they reasonably believe lives are in danger. And people there believed their lives were in danger.
What I might say in another situation is irrelevant anyway. Someone can be right for the wrong reasons.
Setting aside the notion of gunmen manning barricades on public streets here—the SUV they fired on was, by many reports, a different SUV from the vehicle before.
Regardless, this is still the exact type of incident that they were supposedly protesting against in the first place.