I guess that SMRT would not install barriers that soon. I used
to think this way too, shouting the need for barriers, but soon, I
realised that installing would not do much good, the people can
just walk outr through the platform ends and get killed in the same
way.
Many of those access door are not locked.
Underground ones too, I once opened one at City Hall, around
2000-2001 when still a kid.
So if people are bent on suicide, its not barriers, not the public
to stop them. Only social workers would be able to.