I understand Bradford was unaware of Moonlanders or Lunaris’ true evil nature, but sometimes his and McDuck’s actions might have consequences whether they knew it or not.

Agreed, but I wouldn’t say that makes them the “true cause”.

Bradford had nothing to do with Scrooge and Magica's "little spat". Did he play a part in anything that happened in S1?

Well it’s because Bradford told Della about the Spear of Selene which causes Scrooge to cut ties with his family following her disappearance. In Season 1, when the triplets discover the truth on what happened to their mother, they blame their great uncle and Scrooge cut ties again. This allows Magica to help complete her plans of escape while McDuck is vulnerable.

Season 2 involves Della giving away the plans for the Spear of Selene to General Lunaris with even knowing his evil plans for invasion. Louie did weaken defenses because of his lack of business leadership. Still that buzzard telling Della about a rocket is what helped made most of these crisis happened.

Yeah, but Bradford didn't make Scrooge conceal the Spear's existence from Donald, didn't make Della steal it, didn't make Donald and Scrooge decide not to speak to each other for ten years, and didn't make the boys turn their backs on Scrooge when they found out about the Spear.

Right. It was just Bradford wanted to break Scrooge McDuck to prevent any more adventurous which that buzzard hates.

(Reply to Well it's because...)Not that. That happened before the events of season 1. The kids finding out the truth about della was just the aftermath which had nothing to do with Magica.

I meant what happened with lena and the dime and everything.

It was all cause and circumstance like Kilmarnock said.

Bradford blames accused the McDucks for these circumstances.

Well, I guess it's because he wanted to make Scrooge feel worse or something? I don't know. Anyway, one thing's for sure- if Bradford says the earth is flat, it doesn't mean the earth is flat.

(I had a point there, I forgot what it was when I finished typing.)