I appreciate you're no lover of Mostyn Estates, but if it weren't for them and for their control of the town, I doubt we would be writing on this forum about our lovely town, or whether we would even be living here as - although doubtless some urban development would have taken place - I can't see how it would have taken any different form from that in either Colwyn Bay or Rhyl. It would have been piecemeal and poorly planned and would surely have gone down the same route of inappropriate conversions from hospitality use to multi-occupancy and all the attendant social problems and lack of civic pride we see in other towns along the coast.
To describe a whole family as morally bankrupt is pretty harsh, even quoting another author. Like any family I guess you have some bad apples, but then you have others (like Lady Augusta Mostyn years ago and even the last Lord Mostyn-but-one to bring it more up-to-date) who were widely respected and cared for the town and its residents.