Pretty much everything is mearly a matter of perspective. Although you may anticipate someone's reaction to be a certain way, in general they may act as anticipated but likely it would never be 100% exactly as expected.
I suppose as a visual example take a colored sheet of paper, light blue for instance. Now crease the paper and view half flat and the other half at an angle. Although without a doubt you know the paper is one color the flat piece appears light blue while the angled piece appears to be a darker blue simply from the light reflecting differently off the texture of the paper.
Perhaps I am missing the point of your question, but what I am interpreting is its completely possible to have two opposite opinions or feelings on something yet to agree with both.
One other example. Say you were fired from your job, your angry you lost it, your frustrated you have no income, yet your happy you don't have to deal with it, & are relieved that burden of stress is over with.
Initially the roads did not have to be parallel to the rails, they were intended to meander along the terrain between the stations. Just because the rails are straight and narrow don't assume the roads have to follow the exact same path.