Ambitious people in a corrupted system are the most likely to abandon any principles they had and to go along with whatever crazy thing necessary.

Their only principle is what will get them ahead.

In a corrupted context that's corrupt things.

Ambitious people in a fair and functional environment tend to create good.

In a corrupted situation they tend to create bad.

One-ply ambitious people are steamrollers.

When they become accidental loyalists, they can be dangerous. Useful idiots to the corrupt leader.