Kate would also point out that the more manpower and money the government have to throw at repairing things, the less time they'll have to mess up other things, so perhaps they should just continue to look at attacking and damaging buildings - but particularly things like the rehabilitation centre and the foundation centre and so forth, because those actually harm the Death Eaters. In the meantime they could use those smaller targets as distractions while they look at actually trying to get back into the Ministry.