Why don't they just do it?

We all know that hundreds of people fall from trains by being pushed out by the doors closing accidentally. Even while writing this on the way to Bangalore from Kochi in the Intercity Express, the door very near to me will close if the brakes are applied reasonably quick, pushing out anyone who sits on the doorsteps. My question is, why don't they fit a simple latch to keep the door in open position? It won't cost much, and is simple enough to avoid even any discussion about whether to have it or not.

But still our train doors keep on helping people out when they don't really want to.

The simple reason I can think of is that the politicians who rule or the employees who work in Railways are by no way affected by the number of people who die because of this.  Employees get proper tickets on time, and politicians never travel in trains. Period.

And surely, they have excuses for everything - people are not supposed to travel on doorsteps. Definitely. Not at all. But unfortunately, they do. And they will do. If they don't do it out of instinct, they'll be forced to do it by the hundreds of people who travel in an 80 - odd seater general compartment.