Yes, I can answer it (from my point of view). I can't speak for the "people" you mentioned in your first question as I am only one and not a majority ;). I believe, love, fear and follow God because... I made a choice to. Not any more complicated than that, although I will say that in the journey to finally realizing it was that simple I had questions very similar to yours. If you like you can read on and I'll share it.
"Why does God allow what I perceive him to be allowing? Is my perception correct? If God existed and were to explain it all to me, would I be content with the answer? As I cannot, in any capacity, fathom or form thoughts baring similarity to God's could I understand the explanation? Would it really matter if I knew and understood?... and many more. Reaching a point where I was certain the questions would continue in their confusing round-about cycle and the answers remain only an idea as elusive as God himself, I did something many people view as silly. I jumped, leaving my analyzing behind and stripping the moment of all "ifs" I was facing only two options. Just two! To believe, or not. It's an obvious thing really, like "with cream or black?" I make choices several times a day every day without much thought and this one for some reason felt more important. Had I already made a subconscious decision that I had a soul and it was important to make the right one or I'd be eternally screwed? There is a need deep within me to KNOW things. A desire as strong as my will to live. Could I let it go?
The "what if" game is a long and unending one. I will play it for a moment only because of its effectiveness in viewing more than one possibility. What if that child with cancer had lived and potentially played a pivotal role in the destruction of many other lives? Or caused it's parents greater pain in another way. Who’s to say, its life may have been perfectly horrible causing it to wish it had died at an earlier stage in life. Was its death then positive?
Perhaps there are multiple interpretations because as I mentioned before I perceive only as I do. Not as you do or as Joe Schmo does. Let's take five men each baring one of the 5 senses and none of them the same. Place them in a room with a single object… Shrimp Scampi! (yum) What do you think the interpretations of each five men would be? If you were able to explain to the man who bore only sight, the interpretation and experience the man who could only smell had, what might his response be? Could he make a choice to simply believe that the shrimp scampi had a smell? Maybe he needs proof first. How would he find it? If he chose not to believe, does that mean the scampi has no smell?
One thing is certain. I don't know... but I can choose to believe (or not to). I'm content with that.
This is an edit: just my opinion and thoughts, but I enjoy observing the duality in most things. Night to day, female to male, positive to negative, good to evil. Is one any better than the other? Why do we place God in a finite box of only good? Satan is viewed as evil and feared for it, yet the one to be feared would be that which has the most power and is least understood. If the knowledge of good and evil was forbidden and Adam and Eve gained that knowledge and passed it on to their descendants then perhaps being sent from the garden wasn't the real punishment, but the knowledge in its self. Maybe life would be more pleasent if we weren't concerned with having to KNOW everything?