I guess I just disagree that the behaviour required to gain a karma cushion is "good", or "better" than the behaviour that stagnates or moderately shrinks karma.
I personally think that playing in to the echo chamber is a subtler form of abuse; making the people in the community progressively more unhealthy by carefully avoiding anything that looks or feels challenging.
I don't think a healthy community is one which encourages people to fat eachother up on sweet nothings and uncontroversial shower thoughts.
It seems to me that the most popular replies are often the ones which present an obvious, widely-held opinion as though it's controversial outside the group; which enables holders of the majority opinion to think of themselves as underdogs and free thinkers.
I think a lot of harm is done by rewarding people for defending the majority opinion as though it's controversial.