Viewing from a different perspective: Consider the liking and disliking as a choice of mass of people around you. If you really consider that all negative views should be with reasons, that may not happen. Same can be said about so many things happens around.

Efforts may be better spend for lots of positive vote building nodes rather than focusing on few negative votes if voting is an issue for you. If you read a good question carefully which has lots of good answers, without reading the answers, try to come up with an answer and then equate your answer with other answers. You will be able to learn the what are good 'types' of posts accepted by mass here.