it is simple, because of money!
there are two groups that i have seen so far attacking bitcoin. one is the banksters who fear for their future. they do understand bitcoin very well and that is why they don't want it to succeed. they are alive and strong because there have been no alternative to banks but now there is...
the other group are the ones who want to make profit from bitcoin because they hold some small or large amount of it. they attack it at specific times so that they can cause some sort of panic and be able to buy more of it! bitcoin has a small and limited supply after all.
This is definitely the answer to this situation. In any aspect that involves power over something, those who are considering themselves as the rulers will most definitely eliminate the threats to stay at the top just like in politics, business, etc. They will manipulate everything for their own benefits and it has been happening even before btc came so there's really no surprise that those banksters are doing their best to destroy btc's credibility. Good thing there's still plenty of people who see the truth out of all the lies the detractors have spread.
And only aware minds can protect Bitcoin against so many threats and defamations. These powerful guys have full confidence they will keep rulling everything by keeping a population majority they need in ignorance forever! It worked very well by some time ago, but with mass internet adoption happening on the last years this mightiness was threatened.
Alternative sources of information appeared and many woke up to reality. Those who still defame Bitcoin for ignorance do this because they want to be on the ignorance, because at this point information is accessible for everyone.
