The line " there's many lost but tell me who has won " summed it up for me

I think its a comment on what was going on - it would be perceived as being 'Rebel' because the two views were so extreme that daring to debate each view instantly landed the song in either camp. So no win - but I reckon they knew that would be the case...

For me SBS is not a rebel song but a song about Peace ! but unfortunatly misundertood in the 80's may be due to the music, but it's a song against the terrorist, against violence

another song about Peace and against terrorism is Peace on Earth on ATYCLB but this song seems to be unnoticed I think, may be due to the music too...
but the lyrics are also strong in this title (about Omagh bombing)
"Tell the ones who hear no sound
Whose sons are living in the ground"
...
They're reading names out over the radio
All the folks the rest of us won't get to know
Sean and Julia, Gareth, Ann and Breda
Their lives are bigger, than any big idea "

all is said in this lyrics