The problem is if these things are found and become public, it makes the targeted country really dislike the spying country. This creates a political pressure a

The problem is if these things are found and become public, it makes the targeted country really dislike the spying country. This creates a political pressure against aligning with the spying country. Many Brazilians are deeply distrustful of the USA, and are even willing to align themselves with dictatorships. Personally, I'll never support a dictatorship. But many people will just to have an alternative world power pole. Alliances are like friendships. If you spy one your friends, of course they are going to get mad and push you away. We have instead to make opt-in intelligence sharing programs with our allies.