only those people who do not have any responsibility for the use bitcoin prohibited.
good people will use bitcoin for positive things. bitcoin is a useful technology that must be used carefully.

Yeah indeed illegal activity is something bad and will only give negative impact to those who use it. Because illegal activities is absolutely contrary to all applicable laws in the world and also illegal activities is extremely detrimental to their victims or they are all involved in the illegal activities. So, if you want to be successful then working hard.Because of the success without hard work is going to survive in a while and definitely those who get instant success will not develop into greater success

Some people does use those to buy things that are ilegal, but i doubt those make the buyer and seller bad persons at all, we all have a problem, some is alchool, others drugs, mine is internet, this makes me a bad person?
India doesnt allow to gamble, there are several indians gambling with bitcoin, they find a solution to their problem, its a bad use of bitcoin as well, but this even being ilegal its allowing those people to gamble. As fiat bitcoin cant be controled where it will be spent, soo its always people choise where they do business.

i do not think that bitcoin will be use for illegal activity because bitcoin is crypto currency and crypto currency can be use for online shopping and now we can buy online product through bitcoin and bitcoin is really too much modern and stronger currency.

Yes I am agreeing you. That is a fact that bitcoin may not be use for illegal activities in such a large scale. Maybe a very little number of people were using bitcoin for illegal activates, as most of the people are using it for normal activities just like shopping and trading etc.

But the good thing in bitcoin is that it is controlled only by educated people and only they can understand bitcoin and if they adopt bitcoin they will also find some other legal ways of earning bitcoins and they will not need to go for any illegal way to earn bitcoins.

I think not concerned about it dude after all, everyone does not know everyone's goal in bitcoin transactio?, and it will remain confidential and anonymous and it does not harm anyone right?

Visa, MasterCard, PayPal, and cash all serve as opportunities for criminals as well, but society keeps them around due to their recognized net benefit. so using bitcoin on illegal activities will not harm bitcoin as much media  controlled by government.

the marketing of visa, mastercard, paypal etc is bettter and people feel like "this is an honest company" and the technology is safe and good. some bad people try to take advantage, but this is what bad people do. bitcoin does not have this marketing and is not a company, so people with no clue will always blame bitcoin itself, because someone must be to blame and it sure as hell will not be their own fault.

Bitcoin isn't any different from money, and especially not when it comes to how people use money. In that regard, yes, Bitcoin is in fact being used for all kinds of shady purposes. But the same goes up for fiat currencies around the world. The main point of attention is that we shouldn't blame the tool for being used in a wrong way, while people are the ones that should be blamed and punished. Look at cars for example, you can drive with it from your home to your working place, or you can drive your car into a crowded bar where you can kill plenty of people at once. Do we have to blame cars for that? Nope. Same is the case with Bitcoin and fiat, and all other things that can be used as currency tool.