For the typical person, seeing a video of a man burning to death is little more than a horrific form of entertainment.
Not when it's associated with important situations. The visual reenforces the situation. "Hey, these assholes did this." I'd like to see a lot more uncensored reporting. Western culture is way too soft now and is rapidly becoming unable to deal with harsh reality. Your desire for testing people before they watch a video is an example. It's just a video! Hell, large tracts of the population can't even handle lowbrow insults any more without claiming 'hate speech.' This is not good long term.
Fuck testing people to make sure they agree with you first before being able to see/do something. I don't get this attitude either. All that fear over the 'negative' is one of the things that's driving this control freakery. Societies must be able and willing to cope with the bad as well as the good to survive. This is not done by letting the insecure build walls to keep the 'bad' out.