The fact that Union Berlin is in 12th place and has only 17 points in 15 games is the reason for this. Union was one of the good teams in Germany in recent years, but they are far from their good old days. Maybe they can be better with a change of manager. I can understand them wanting to try this.
This season Union Berlin are very far from the expectations of being able to improve in the Bundesliga so their efforts in changing managers are actually a very reasonable thing because Union Berlin also want to see better changes in their team. However, for this season it seems that there is still time to make any changes in the team so that the position of a team like Union Berlin can be slightly lifted up even though it will still be quite difficult to reach important zones such as the top four. But Union Berlin still have to try in the second half of this season.