If you want to look at things through a party political prism, it gets very complicated. Lakanal House, for instance, occurred under a Labour government, but by the time the findings of the enquiry were published, there was a Conservative government in power that took no notice of them. Boris Johnson presided over cuts to the fire service while he was mayor, but it was a Labour decision to divest the fire service of its assessment responsibilities (supported by Tories, it must be said). Apportioning of blame along party lines is a complex process, therefore, and not necessarily that fruitful, when culpability will likely be narrowed down eventually to more specific decisions and choices.
What is true, though, imo, is that much of the decision-making that led to this catastrophe was made in the context of a politicised business culture that has incrementally allowed, condoned, encouraged and eventually rewarded greed. Business entities obviously exist to make a profit, but now also have serious questions to answer if they don't prioritise the obscene gains their shareholders have been encouraged to expect ahead of quality, safety or ethics. The public sector also has gradually been sucked into this profit-making imperative, to the point where service, care, honesty, etc have become an old-fashioned joke compared with the all-importance of the bottom line. Nowhere is this more vividly illustrated than at the interface between the public and private sectors, where, thanks to Thatcher's toxic legacy, an emasculated public sector is at the mercy of whatever the private market imposes, while those same private companies are openly allowed to operate in a moral vacuum that permits - for example - a construction company to go bust, owing creditors millions, only for its assets to be bought for a song by a very similarly named construction company owned by the same person, which then takes over all the liquidated company's lucrative contracts. Not naming any names, of course.
To me, tackling that corrupt business culture is the key political challenge, and I don't care what colour the government is that takes that challenge on, though I strongly suspect, of course, that it won't be the Tories.