Hitchhiking Across The Galaxy discussion

I see that this is a small group, with only one post, and no activity in months, but it was the only appropriate group I could find...

I just finished reading Asimov's Foundation trilogy. In the third book, Second Foundation, the people of the first Foundation consider the Second Foundation to be their nemesis. This is the whole basis for the story. Hari Seldon had created the Foundations, both the first Foundation and the Second Foundation, to be the watchmen of the Seldon Plan. With the rise of The Mule in the second book, Foundation and Empire, the Seldon Plan would have unraveled, had it not been for the Second Foundation. As far as we are led to believe, the Second Foundation is benevolent. Why does the first Foundation fear it so?

I wondered this all the way through the third book, expecting that sooner or later it would be made clear, but it never was. Did I overlook something? Why was the Second Foundation thought to be a malevolent force?

The First Foundation was a vigorous and active force. The "history" of their efforts span 1000 years. In that time a lot of mission creep can occur, especially since things got off track with the rise of the Mule.

The Second Foundation was regarded as a hidden and manipulative force that the First Foundation could not control. With no communication (that they knew of), it isn't at all far-fetched that the Second Foundation would be regarded with suspicion.

I'll admit its been quite a few years since my last read of the trilogy, but that's my take. If anyone has a different idea or would like to expand on mine, please have at it!