You will need a strong stomach to watch the video of Porto forward Moussa Marega walking off the pitch during his club’s game at Vitoria Guimaraes. The racist abuse started before the game had even started. Midway through the second half, Merega had had enough.

That in itself would be bad enough, but worse was to come. As video footage shows, his team mates, instead of walking off the pitch with him, tried physically to make him stay on it. And, incredibly, Merega received a yellow card from the referee.

I’ve nothing new to add, here. The offending supporters should be prosecuted and banned from watching live football for life. Vitoria should be punished in ways that massively hurt the club. Not a piddling fine, but a significant points deduction or even automatic relegation. If it means the majority of supporters suffer because of the actions of a minority, then so be it. Many in that majority may well have turned a blind eye to racism in football, so it’s their fault, too.

Yes, racism is a worldwide social problem and it was not football that invented racism. However, the ‘society is to blame’ argument has consistently failed. If government, the elected voice of society, has failed to act, then football’s authorities should.

Sometimes, I think I’ve seen it all, that nothing can shock me. This video shocks me. We can’t go on like this.