I am not sure that declining to support a visual gesture of something translates as a position that is against it.
Not supporting this gesture does not mean that UEFA is supporting Homophobic laws of other countries.
I believe that UEFA has taken the correct decision in not bowing to social pressure - because it would set a seriously bad precident for future gestures on future occasions.
If you take one gesture and provide it, then what happens when England play Scotland, and Scotland wants an independence support gesture to be provided?
Or Israel plays an Arabic nation, and one oor other, or both, decoide they want their political stance on the West Bank to be confimed to the watching world?
It's a slipperly slope, and the easiest and best way to avoid sliding down it is to avoid as far as possible letting sport become overlly politicised.