She's suicidal, ok. But how about the blood-filled classroom? If Satsuki will allow her to off herself, then Komako will die and...? Or Satsuki will give up on her resolve and grab her, resulting in Komako going berserk and becoming a bomb woman of something.
I get Komachi's logic, tho. She's been drilling self-hatred onto her head because she's different from others. Unlike the Prez, she had no say at anything because she can't see how or where the death will happen, so the logic is that if she warned people I'd just been seen as "bad omen". Her ultimately deciding to not tell Satsuki anything makes sense in her "I am inherently something bad to others".
Finally, I will temporarily remove my "Komachi is the antichrist" statement because she's not actively wishing for others to suffer, even if she helped Seo that one time with her attempt at killing people in the classroom. Unlike Seo who was "I want the bad guy to win", she wanted no one to be harmed and saw the fight of good vs. evil as something wrong because sometimes what we do is essentially cheer for the one side we picked when they are doing the same thing the other is (beating the crap out of someone, destroying property, killing the villain — it's all good as long as the "good guy" does it? "The end justifies the means" is not a philosophy everyone would agree with.)
Yeah, we'll have to see. So far there's only tragedy for her. We could have had supernatural yuri girls. (Satsuki can have two gfs. Or all relationships could end as platonic and they'll all just be very good friends)