It does work like that: in bacteria (as in the OP), there are no highly stable intergenic regions, and in viruses (as in grandparent's suggestion) where there a

It does work like that: in bacteria (as in the OP), there are no highly stable intergenic regions, and in viruses (as in grandparent's suggestion) where there are rarely significant intergenic regions at all, the mutation rates are the highest recorded.