1. The word "akin" I thought it is similar with "like", was it wrong ??
=> well i don't think they are the same. there are some other synonyms for "like": such as, for example, including, one of which is, for instance, namely,...
2. did you mean decadence ??
oh yes, sorry about the spelling mistake :D
As for the conclusion, you should paraphrase the rubric, then summarise what's been stated in the body, and perhaps add a conditional sentence at the end.
Here's my suggestion: "In conclusion, it goes without saying that the private lives of famous people are being put at the centre of public attention. However, I am of the opinion that such personal information should not be publicised on newspapers and magazines due to the latent decline in moral values and the fact that the media is making use of these stories in negative ways." Just a suggestion. Hope it helps.
By the way, the topic doesn't ask you to discuss both sides of the trend, it only asks you whether it is appropriate to do that, so I think you should focus on answering the question by giving reasons why you think it's not appropriate in the body, not what the positive effects of this trend are (the first body para).Best