In 2007 China successfully destroyed one of their own aging polar-orbiting weather satellites just so they could prove they could. Debris from the destroyed satellite collided with Russia’s BLITS satellite in 2013, resulting in thousands of pieces of new space debris and is considered the most prolific and severe fragmentation in the course of five decades of space operations. Thanks China.
Now all we need is for North Korea to get their hands on that technology.
Still, space is a pretty big place and the pieces of junk are known and plotted so we can stay away from them, including little nuts and bolts travelling many times faster than a bullet.
Ever see the movie Gravity? Flaws in the science, but it was all about space junk taking out everything up there.