Both drivers were looking to benefit from a major overhaul of the Toro Rosso as the team ran with the new diffuser, front wing, nose and top bodywork that has served sister team Red Bull so well since Silverstone.
The court was told the men had gone out seeking some form of revenge after another youth with red hair verbally abused the sister of the Booth brothers.
The boy, 14, was playing football on a Lincoln estate when his arm was broken by men "wanting revenge after another red-haired youth abused their sister".