Bitcoin is safe indeed but it is for long term mate and not for ASAP earning .
Bitcoin is not safe, it is risky and that's why you and I don't want to convince others. Because no one wants to be blamed or held accountable. I agree with all the comments that it is not advisable to convince someone because it is in their interest, if they refuse, let them choose.
Bitcoin can make someone goes rich overnight and also can make you lose everything also. Its is best before to do trade with bitcoin once need to learn about it first rather jump like an idiot and losing all their saving. I already sees a lot of mistake thinking they can make a lot of money with bitcoin trading and loses everything they got in the next day because of greed. Learning about bitcoin will save a lot of your hard saving and always do trade what you can afford to lose is a great way to learn and try something you didnt know too much about.