I appreciate tax brackets are slightly different across countries but compare someone who earns 50,000 to someone who earns double at 100,000.
The higher earner pays 2,620 in tax, taxes home 5,713. So they're paying just over 30% in taxes. Someone who earns 50,000 takes home 3300, pays 1000 in taxes, so 23%. So the person who earns double pays an extra 7%. It's not exactly the rich sacrificing so much more than the rest of us plebs is it.
Edit : I'm a fool who attached the wrong screenshot, the text refers to 50k, not 46k. Don't know how to change it!