Nobody on this thread is claiming that we "get to decide" anything.
Just that we don't like this graffiti.
By being so egregiously ugly, it is not going to reach the hearts and minds of most people.
The thing with (say) a beautiful stained glass window is that the beauty catches your eye, and holds your attention and wonder, and then as you keep looking you see a story in the image and you ponder it.
When I see this graffiti I just think "yuck" and look away - and so would most people.
The only people who keep looking, determined to find some kind of meaning* in the ugliness, are those "arty intellectuals" I mentioned above. So that predetermines this art to be exclusivist.
*See examples upthread, like is this symbolism of the future of the Church blah blah.
It is not inclusive. Your average hoodie who actually does graffiti himself would not be moved by this. The only people interested in this are people who try to "analyse" it.
Surely tthese art-analysts are not the people the cathedral is trying to speak to?
Whereas beauty, like a stained glass window or the sound of a voice echoing for minutes under a perfectly arched ceiling, can reach people from any background. Anyone can feel awe, and awe can be a gateway to further contemplation. That's one of the reasons they designed cathedrals to be beautiful in the first place
Edit for many typos