It is a worry alright. There was also a bomb on the ghats at Varanasi, during the evening river pooja ceremony - 15 tourists were injured.
Seems we now live in such a world. A Pakistani woman I was talking to recently said that in Pakistan people now have learnt to live with regular bombings. She said on her last trip home, her brother said to always go out after a certain time, as bombings are less likely after that time; and if there has been a bombing, then it's safe to go out, as there is typically only one per day (although there are now often two or three within a few minutes).
Unfortunately this will give fillip to the right-wing political groups. And you can sympathise with them, up to a point, although that is not an answer either. Recently there was an article in the paper about Afghanis in England who send money home to support the Taliban, and even take holidays from their jobs to go and fight with the Taliban.