if these so-called artists are going sample chunks of other peoples work then of course they should be penalized.
if someone steals my stuff i want to see their ass fried. they're taking away my wages and parasiting on my work. are they so lacking in talent they can't make up some of their own stuff ?
you want to rap over some beats ? well buy some beats - theres so many apps or loop disks for cheap these days. why steal ? maybe for some people this question is the same as 'why use warez' ? they just don't want to be bothered. lazy
it's just like the mp3 file-sharing whores. seems to me a lot of kids want something for nothing these days. and then they start crying like babies or getting foul-mouthed if someone suggests they should actually pay for what they want !
personally i hope that the record companies nail every one of these music swappers.
bottom line: if you want something, do some work earn some money and buy it.
and if you write music, write the whole dam track yourself, or be prepared to face the person you stole from in court