Don't confuse these scam companies with Bitcoin. It's like saying stay away from the US dollar because it is used for buying and selling drugs, weapons, contraband, ransoms, etc, lol.
There are a lot of scam companies out there that like to dealing in bitcoin because it is almost impossible for the government to take back from scammers and it is easy to hide. That is the case of the first article. You can set up your own wallet, privately on your own computer or use blockchain.info, which is the most reputable online wallet.
The second article refers to a shady online drug dealing site. If you don't think drug dealers might possibly steal your money, well then, maybe you are too naive for bitcoin and dollars, lol.
The last one refers to hackers taking control of bitcoin mining pools. As an end-user of bitcoin you don't have to worry about that. It only affects the generators of bitcoin and does not make it any less secure.
Bitcoin, as a protocol is perfectly secure. It's biggest advantages are also what make it attractive to criminals and the black market, and, to be honest, under-the-radar services like escorting too. It is very useful when used legitimately too.
