Eh bro ... I dont personally know any of those sources, but have spoke with a few of them on a few occasions. I do know some sources very well though, it it would really suck to go see any of them go down.
One thing that you really do have to remember though bro .. is that no one forced them into this. They made the decision to source. As the old saying goes .. dont do the crime if you cant do the time. Sure ... you can make a lot of money sourcing .. but you also have to realise, that at ANY point your life can get flip turned upside down .. just like that. Its the risk that they have all decided to take. Some are definately much more carefull than others ... and some have just have much worse luck than others as well. Its all a big risk.