This is a capture the flag type battle.
So what do all those speedy scout tanks do? Yep, rush headlong to the flag and start to capture it.
With any luck they’ll be killed before they reach it, but sadly sometimes this fuckers do win the game in a just a couple of minutes. For what? To get XP? Or credits? The experience you get for capping the enemy is NOTHING compared to what you get if you’d kill the enemy off instead.
But then that means you have to make some effort.