There's no justice in football

With reference to few last team tournaments (WC, Euro).
Group stage. 4 teams. 6 matches.

Let's analyze two margin cases.

Case One, scores:
Black - White 1:0
Red - Yellow 1:1
Black - Red 1:0
White - Yellow 0:0
Black - Yellow 1:0
White - Red 1:1
1. Black 3 9 3-0-0 3:0 +3 next round
2. Red 3 2 0-2-1 2:3 -1 next round
3. White 3 2 0-2-1 1:2 -1
4. Yellow 3 2 0-2-1 1:2 -1
2 points are sufficient for Red to promote!

Case Two, scores:
Black - White 1:0
Red - Yellow 2:0
Black - Red 0:1
White - Yellow 1:0
Black - Yellow 2:0
White - Red 1:0
1. Black 3 6 2-0-1 3:1 +2 next round
2. Red 3 6 2-0-1 3:1 +2 next round
3. White 3 6 2-0-1 2:1 +1
4. Yellow 3 0 0-0-3 0:5 -5
6 points are insufficient for White to promote!