Those people are negative person. They are not open-minded in other things. Instead of knowing bitcoin they ended up by smashing only and attacking bitcoin.

Before we can arrive at that question let us ask ourselves why there are many people who are into bitcoin. The simple is because of profit and income. Majority of bitcoin holders does not care to know the basics of bitcoin and cryptocurrency since it is not their concern. Their concern and priority is the $ value of bitcoin and that is why it is easy to attack bitcoin since there are less people who understand bitcoin clearly.

If only bitcoin holders does not look at bitcoin as an investment but as medium of exchange then we can change the mindset of people but as of now it is very hard to change this sad fact.

People are naturally adverse to change, but more importantly they tend to be negative on things they do not fully understand. It is just human nature. Most of the negativity is from people who do understand it, but have a vested interest in down ramping it. The rest are just people who dont understand it and find it easier to be negative, than spending the time to gather all the information and form and informed view.  This is why i believe the real opportunity right now lies in educating the populous on what BTC is and how it can help.

Do you know how  PayPal, banking system and Visa works?
People deal with Bitcoin as a coin that has no physical presence.
This lack of information is due to:

• media that is always trying to show the bad side of bitcoin more than a technical revolution based on science and mathematics.
• There are no clear references to the bitcoin because of rapid development.
• Scam ICOs

They listened that terrorists use Bitcoin, so.. most of us (people) don't want to use brain

Yeah, good question.

I mean bitcoin is really just a public science project.

Can volunteers from around the world make the one's and zero's of a computer simulate the characteristics of cash,  in a non-censorable, non-confiscateable,  non- double spendable way?

If so, is there any utility to some portion of humanity for succeeding in this science project?

That's all it is. No need to hate.

People who do not understand Bitcoin deface and attack it precisely because they do not understand what it is. People tend to be afraid of things that are not understood and alien to them. Feeling of fear provokes aggression, since it is believed that the best defense is an attack. People do not understand Bitcoin and can not subdue it, so they oppose crypto currency.

Bitcoin's industry is quite complex though once a person understood the basic fundamental of Bitcoin it is easy for them navigate. Though what makes these people attack Bitcoin is beyond our control. Every one do have different perspective towards this industry and even though they understand the system they tend to not believe on it. Bottom line even though evidences are already presented in frontbof them they reject it and claim that it is not true. From there on, FUDs are starting to rise which are unpredictable.

Actually people hesitate to take risk. due to which donot grab opportunities which consist higher risk. but one think people has to understand it that without risk you can't become millionnaire.

Because they are closed minded and treat bitcoin instantly as scam because of its accessible and easy to earn money features. They think it is somehow similar to those pyramid schemes with such promises. That's also a reason why it is hard to convince other people to join bitcoin.