I don't see this as a goverment issue If the captain of the aircraft has reason to think that there is a bomb on the aircraft then he/she should order an evacuation.
If the authoritys won't provide steps then the slides must be used to ensure passenger safety.
My worry is that these things are in the hands of some goverment ministers who would not suffer if the worst did happen, in fact it could be usefull to have an event like this to hide some bad news. But this goverment would never stoop to that would they!
In these troubled times a captain has to have the political issues in mind after all how can the authoritys stop you evacuating an aircraft when they won't approach it? and what can they do when you have evacuated ? if they take you to court on some trumpped up charge they will make fools of themselfs when you ask the jury if they would like to be trapped in an aircraft with a bomb and 2000kg of fuel.