How should I handle this situation?

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Yesterday, while me and my son and daughter was in the front room watching T.V. something silly happened. I heard the the screen door moving. It was like someone was trying to take a chance at knocking on our front door. But they didn't. So, I was wondering what was taking them so long to knock. I looked out the window, and two kids saw me. One of them was a girl, she was on her bike and the boy was right behind her too. She rode off and he was running behind her. They were both laughing. My son said that he recognized them as being the two kids that he played with. Which was my neighbors children. The same neighbors that have been coming around and asking me and my husband for this and for that. I told my husband about it and he thinks that I should ignore it. I feel that their kids had no right to just come to our doorstep and open our screen door without knocking. And then to run off laughing, it makes me feel like they were up to no good. I would not be surprised if their parents knew what they did. Why do people bother others when they don't bother them? Sometimes I get the strangest feeling that people try to upset me just because I don't talk or speak to them at all. I only don't say anything because they act as if they don't want to say anything back to me. People walk and ride throughout our yard whenever they feel like it. They even throw trash in our yard too. It is very sad how people treat us when we don't bother others.