There's Reasons Areas Are Closed In Detroit During The Fireworks

The Detroit Free Press: Detroiters make the best of fireworks night, but deserve more 

The author of the article bemoans that certain areas of Detroit, especially the parks by the Riverwalk, that offer prime viewing,  are closed off for viewing the fireworks for the 4th.  Verily,  he feels the parks should be opened up for viewing.

Of course, the article then states exactly why the parks are closed.  It's  because some people really can't behave and end up shooting other people during the fireworks show at those parks.

In short they may "deserve more" access but they're part of the problem for the closures.

But the Detroit Police Department offers a pretty good reason for it [the closures]:

In 2017, a 46-year-old woman was shot just before the fireworks began, struck by a bullet during a dispute that didn’t involve her near the Spirit of Detroit statue. In 2013, a 37-year old man was killed about a mile from Hart Plaza during the fireworks show. In 2011, a 16-year old girl was shot in the leg as she and her friends walked near Atwater and Beaubien near the Renaissance Center. And in 2004, nine people were shot in Hart Plaza following an argument, according to Free Press archives.

Yes, the parks are closed because the Detroit Police can't be in every park on the 4th, and it's inevitable some hoodrat is going to feel disrespected and pop off some rounds as a matter of course. 

It's a bit more of a deterrent, and perhaps less likely to happen if its near where the police actually are out in force.

Meanwhile, another Detroit Free Press Writer notes exactly why the Detroit area can't have nice things:

The Detroit Free Press: Young people fighting at metro Detroit events is ruining safety, summer

Note how he says "Young people" or "teenagers and young adults" and draw your own conclusions. 

He doesn't come out and say that it's the hoodrats and yutes from Detroit and other certain environs that are ruining the area festivals, but that's exactly who is causing the problems at these summer events.

Orchard Lake St. Mary's had to close the Annual Polish Fair, of which I have very fond memories from taking my kids there, due to hoodrats coming in and causing fights and mayhem at night, due to the excess costs for security.

We can't have nice things both in Detroit itself and its surrounding environs because some people's kids just can't behave properly, and their community isn't cracking down on them or showing them the appropriate way to behave.