Although I don't doubt the level of depravity of this group, in the Maui fire case it sounds like they didn't need to set any fires. This disaster was created by either gross, or planned, incompetence. Not cutting back the grasses/weeds, and tree branches, from the power lines was an invitation to a fire whenever strong winds came through. And when the strong winds came through (due to a known hurricane down south) - to not shutdown the power lines was another case of either gross, or planned, incompetence.
I don't think the fires were started on purpose - by someone with a can of gasoline - but it was a disaster waiting to happen (at the appearance of some strong winds). This disaster was due to malfeasance in not providing rudimentary precautions (by clearing the foliage away from the power lines), and not reacting properly - by shutting down the power when the winds were strong.
Whether this malfeasance was due to incompetence, or planned, I don't know. But yeah, the people you mentioned are evil.
“by shutting down the power when the winds were strong”
People with lung disease depend on mains electricity to run oxygen concentrators.
Power should only be cut of as required by law (and executive order).
Lines might be tested for durability to say 100 mph wind force.