"i just don't see how professional players can make silly decisions like this on a CONSISTENT basis"
It's worse in CS, trust me. There's a player called NiKo whose team choked at map/match point in major grand finals TWICE. Both on 15 (scoreline needs to be 16-14 to win the map without OT). And a shit ton of other players.
So many players make mistakes, and I don't understand why people flame players for making mistakes; they're only human. I doubt you have the strength to be in the Grand Finals of Masters trying to win. You'd bottle it, just like everyone else in this forum. Everyone hates on players but don't have the balls to actually do it themselves and experience what it's like to be in their shoes.