Remember the practical rules that will inevitably govern the behaviour of any alien "visitors":
1. They will be predators by descent at the apex of their food chain. 2. They will be utterly ruthless in their attitude to any competitors. 3. They will put their own welfare before ours in all cases. 4. They will assume that we operate as a species to the same rules.
So we should not greet them with "Free Hugs for Aliens" posters ?
"I read the news today, oh boy..." some lads from Liverpool