Simple question for Christians.

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From an objective/scientific standpoint, yes. Looking out for each other is a good way of making a good society, which is then good for all of us. That is what has worked, and how we've evolved to be.

On an individual level, the motives may vary wildly. Some people may simply treat people well in order to curry favour and to avoid being arrested. Personally, I treat not only people but animals well (animal welfare is fucking disgraceful). There's not a lot I personally get back from treating animals well. I actually make life much harder for myself. I would think most people go above what is needed just to keep society going, and genuinely care. For example, I stop people on the street and ask for directions. Most of the time, they help me. They don't know me, or get anything particular out of helping me. We're just wired that way, on the whole. We help.

Of course there are exceptions, and societies can become hideously corrupted when someone evil gets in charge by force.

Oh yes, we're also quite prone to follow others as well. This can be good or bad depending on who we follow.