No.Your answer to the valid point about derelict properties is to try and make out that they can't be brought back into use, but it doesn't end there, a more competent government than the present one would at least attempt to deal with the issues preventing them from becoming viable homes, they can be part of the answer, like it or not.
As for sneering at people's objections to new developments, each one should be taken on it's individual merits, but you prefer to label all objectors as nimbys and cranks.
Do you really think that people living near the Manhattan like having it as an empty eyesore? Of course they don't, that doesn't mean they will automatically accept any plans put forward for its development.
I gave reasons as to why many empty/vacant properties cannot be brought back into use easy/immediatly.
The local authorities are the biggest landlords and are responsible and not central Government
Objections are taken on their merit and all open and transparent online. 90% of objections are spurious if you have a look at the online planning portal