Why they resign?

Its widely seen in Indian political scene that whenever there any attack takes place, any big rail/plane acident take place, any massacre takes place, naxalism/terrorist attack take place, vendalism takes place etc etc.....our politicians run away from their post by resigning in place of fixing the problem and to solve it.........I see its a kind of quite irresponsible behaviour which our top politicians, bureaucrats seldom posses......yes it is true that if any harmful incident takes place in the tenure of anyone, its a clear failure of the regime but it doesn't mean that u resign afterthat instead of solving the problem yourself and give an example that the incident didn't happen due to common failure of regime.........I am deeply hurt when Mr P Chidambaram, home-minister offered to resign after Dantewada incident.....everyone knows that it was a quite planned attack and was quite tough to avoid.....but aftermath the resignation of Mr Chidambaram was another shock & it raises the question on the ability of this well deserved Home minister....instead of giving a big attack on maoists, he offered resignation under pressure of BJP. ....Home minister ji still time is not spared & I expect a big attack on the heart of Maoists who have become the biggest threat for India today.