Why are they selling?

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Hello all. This may be a silly question but I'll ask anyway. I'm still in the early stages of planning my business but so far have decided that I am going to own multi-family properties and rent them. My dilema is this- every time I find a duplex that interest me (good price, already has tenants, etc.), I can't help to wonder why it is being sold which generally scares me away. Are they selling because there is a pending catastrophic, structural deficiency? Are they selling because they know something about the market that I don't? Does anyone else ever experience this? If so, how do you overcome it?