I'm not pretending it doesn't do anything. You specified an incident which involved missile throwing and getting at fences saying it stops that behaviour when both of those things have literally happened in 2026.
It definitely does the job in terms of its aims of keeping fans apart outside the ground, don't think anyone disputes that.
The point is whether that's a proportionate (or even fair) thing to do relative to the amount of trouble there is without it. I and many others say it's not.