Yes. It's none of our business
That's all well and good but what would have happened had we said that it is none of our business and England is on their own against Germany?
I'm just making the point that we have to look at the consequences of non action. Many times they are worse than action. It would be great to live in the black and white world of keeping to our own shores and to hell with everyone else, but in today's world, events around the world directly affect us at home. As such we project our power for our interests across the globe.
It sucks but instability in the middle east (i.e. nuclear Iran) causes spikes in oil prices which directly affect our energy dependent economy.