In my point of view,it is essential to have full confidence to the public interest to progress - even to the opposing side - and avoid negativity by all means, because negativity has as a result lack of confidence from the public side which leads to violence to ones self and to the society as a whole.
Please define 'negativity'? Anything that makes you feel uncomfortable? That would be pretty shallow and vapid, if so. That is pretty much what I hear when I hear people whining about 'negativity'. Think that you can remove the 'neg' side of a battery and have it continue to function? Do you think that a stilted walking 'smily face' in denial of the depths and nature of his humanity is 'healthy'?
The OP implies that one can be 'one thing', one 'way', one 'mood', one 'feeling' all the time. The reality of life is that human 'moods/feelings' cycle regularly, from moment to moment. To attempt to alter that 'truth' is to invite disappointment, disillusionment, suffering.
Sometimes the cup is half full, sometimes half empty, sometimes too tall...
Perhaps personal 'comfort' is the goal in life for some... it seems rather trite to me.