Odds of intelligent life occuring?

[Anomalocaris]

Now I'm not going to let exact facts get in the way of what I'm thinking, but you'll get my general supposition.

1) The early earth has a massive collision with another huge arse planet thing. -extremely rare (considering the emptiness of space)
2) Somehow the earth was able to keep our huge arse "moon" (bigger than pluto!) into earth's orbit (extremely rare) (did our molten iron core help with the gravity needed?)
3) The iron core helped create a strong magnetosphere protecting future life from solar anhillation! (just made that bit up but it sounds reasonable )
4) The big moon's gravity affected the earth's tides substantially.
5) All this just happens to occur in a goldilocks zone. The rareness is even moar extremelier!
6) Big brothers in space (Jupiter, etc) help with deflecting incoming space junk from hitting the earth.
7) Chemistry + energy (the sun) + tidal forces + billions of years = microbial life (biology)
8) In a billion years of life + evolution = many millions of diverse life forming. (most extinct)
9) Only one species becomes intelligent in a billion years of nature rolling the dice. Another freak chance accident of evolution?

On their own, these events are very rare. To have them occur all together is fucking rare!
(I use "fucking" as a scientific term to get my point across, "fucking rare" is 1 to the power of Godzilla for the mathematicians here)

This is why I believe intelligent life is so ridiculously rare, it's practically a novelty of the universe.
So rare that 99.999% of all other intelligent life (I'm not saying there is any, please don't put words in my mouth!), won't ever contact any other life.

So yes theists, we are special! (but not in the way you guys think we are)

We underwent miraculous odds to get here so what do we do? Elect Trump in the position of the most powerful man in the known universe!@

   

Don't really have a point to make ... Just putting it out there.

We have a evolutionary tree sample of one. We know it is a tree, but vast majority of the branches are gone, and most of those remain unknown to us. We can't be entirely sure whether the tree truely has only one root system or several intermingled ones. We are not entirely sure just how many trunks it has ever had.

We are not sure if this is the only tree that ever germinated on earth or there were others.

We have no fricking clue how the tree would grow if planted in different soil.

We are not even that sure what the soil was like when our tree first germinated.

So let's not be so bold as to say some form of evolutionary trees leading to some form of intelligent life can only grow in environment and soil conditions we infer to have existed on earth.