Let your football do the talking

Just got back from playing 5-a-side. We lost 8-6 but played a lot better than last week. It was against the team of youngsters who've got a bit cocky against us in the past sometimes but they didn't tonight as we made sure they worked for their win. It got a bit tasty at times though unfortunately. Quite a lot of fouling, pushing and shoving and stuff. There's just no need for it, I reckon. I scored three and set up two more without playing dirty. Why do others feel a need to?