Um, Smoke actually tried to save him, but Raiden prevented him from doing so
And "ruining someone's life"? More like trying to prevent destruction of the realms
Y'all really gotta start seeing things from Raiden's perspective; he had his reasons for stopping Smoke and not saving Sub-Zero
If he were "pansying out" (which is stupid since Raiden is far more powerful than a bunch of Lin Kuei cyborgs, and could have taken care of them easily if he actually wanted to), then he would have let Smoke go after them while he just sat back and watched them
So I'm pretty sure that him allowing Sub-Zero to be captured was intentional
Preventing Smoke from getting captured was a vision that Raiden had, and since his visions were related to stopping Armageddon, that was of higher priority
You might say "Ooooh, well, just because he had to save Smoke doesn't mean that Sub-Zero had to be captured"
But him getting captured along Raiden preventing Johnny Cage's death was NRS' way of proving a point (I think there was another one, too), that interfering with the timeline could have adverse effects
So it's very possible that he didn't want to make a rash decision and **** things up even more
Not saying that I particularly like how things happened, but it is what it is (which isn't Raiden being a pussy as people like to think happened)
There are worse offenses on NRS' part, anyway, such as Kung Lao's death, and how nobody, whether it be Raiden or anything else, warned him about Kahn sneaking up on him
And the reason why he didn't think Sub-Zero was the one was because for one, Kuai Liang wasn't even in the 1st tournament, and all of the events of the tournament led up to him concluding that Liu Kang was the one, so why would he think about anyone else? The evidence at the time that Liu Kang was the one was overwhelming, especially since he got a vision of him winning the tournament. If you want to go that route, then you might as well start questioning, "Well, why didn't he think Jax or Sonya was the chosen one?"