This intentionally lit narrative is mostly bullshit. Sure some have been lit by psychos... and children.
The media is playing this up and ignoring the truth.

These fires have been escalating for a few months now. Most of these fires became out of control during our burning off/mitigation period late last year due to extremely strong winds for a couple of weeks.

I personally noticed the fire mitigation that was happening locally. Then we got smashed with extreme wind and before you could say "this is government negligence" there was like 150 fires burning out of control.
Combined with a lot of fuel as they've not been burning off enough in recent years.

It's pretty bad though, worst bushfire season I've ever seen.