Survivor contestants don't need minimum IQ

Watched Survivor yesterday and I found it more frustrating than entertaining this time.
Erik proved once again that a minimum IQ is not required to enter this competition. Is there a name for this kind of stupidity?
Only five contestants left,four woman and one man.
When Erik won the immunity, He was sure of top four spot.
But the woman played the sneaky game again and Erik(Sorry Erik but from now on I call you the Idiot)gave up his Idol in an attempt to make himself a bit more popular in the group.
Now listen Erik, You were the last man,you won the last three immunity challenges, off course no one likes you. If you have that Idol at this stage you keep it, it's as simple as that. PURE STUPIDITY!
That it is less about physical survival and more about playing the so called social game is quite obvious to me.
I can not remember that one of the four contestants left ever won one of the challenges.
They all seem to be saying one thing and then doing the other.
To me, the survivors are already out of the game and what is left are just mediocre players who are only good in back stabbing.