I'll give one for each side.
Yes, without question. The less we know about all the horrors in the world, the more we can simply appreciate our own status in society. We do not need a constant barrage of news -- bad or good -- to be happy; all we need is the basic knowledge to stay alive and healthy, and beyond that we don't need to know about all the bad things that are out there.
No, without question. The more we know about the wonders of the world, the more we can appreciate our own existence, which is truly extraordinary. We are alive! Rejoice in it and learn about your life, because knowledge gives new understanding to both our joy and our needs, simple or complex.