Why move semis out of bangalore?

It is very disturbing to see IPL mgmt taking a decision to move IPL semis away from Bangalore. We the Indian people itself take decisions like this, then foreign people will also look at India in the same way. Does that mean , now no Championship should happen in India? We need to trust our security personnel and should not get disturbed by one of these incidents. This does not look like a thinking decision but looks more of a political decision to shift the venue. My sincere request to politicians and IPL Mgmt not to tarnish the great image of our Bangalore. Are we saying, other cities are safer than Bangalore?