They should be sending this to whoever manages that field too, there is a reason the safety base is required for most youth baseball and softball leagues...
Also, I would agree with a coaching issue on both sides. The collision is both of their faults. The runner isn't anywhere near the baseline and the fielder is standing over the top of the bag.
Exactly- he runs through the first baseman's glove arm as he reaches for the ball. The first baseman does everything wrong with his feet & positioning, but the runner is worse. He's 3 feet in fair and chooses the inner most part of the base.
It makes me wonder if the kid wasn't obstructing the runners all game long and the coach didn't tell him to run through him to "send them a message." It doesn't look malicious, but there is no other explanation for the line he takes... other that lack of experience or understanding.