Common safety issues in Non AC coaches.

1. Snatching of jewelry/Mobile/Camera etc. from doors and windows.
2. At major cities outers, trains become slow and local goons enter in coaches and run away with snatching bags etc.
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more...

It is tough to install automatic closing sliding doors in non AC coaches which result for accidents in which passengers slip down while trying to board or deboard from moving train.
4. Loot, robbery, illegal chain pulling will also stop if trains will be fully AC and auto sliding lock doors. Even during unscheduled halts, doors will not open.
5. Ac coaches are having auto cut system so if coach is empty then power consumption will be less but in Non AC Coaches, fans always remain on(Considering 60W pe fan approx. 2KW per hour per coach).
6. Non AC coaches get dirty within less time compare to AC coaches because all dust and other things can enter from outside.
7. Even in case of stone pelting, AC coaches are safer since stone firstly hit the glass butin non AC coaches, it may lead to serious injury.

In the last if finance is only issue then that can be solved by providing subsidy to poor peoples. Those will still not be burden since cost of travelling in sleeper class is almost near around as AC classes now.