There are a lot of allegations being flung around, particularly directed at the Tory party. But the fact is that since these buildings have been around for decades, it reflects badly on both parties really doesn't it? The Tower itself was built in the early 1970s (Tories), but commissioned in the late 60s (Labour), but supervised by a Conservative Council. A Fire Safety report focusing on Tower blocks has apparently been "sat on" for four years (Tories), but probably even longer than that (also Labour), especially since the last fire in 2009 (Labour).
As for who is more "at fault", one way or another that's what the public enquiry is for, and for my part I intend to wait for its conclusions to come out.