Not to say the allegationsa aren't true, but when something like this breaks, the university has no choice but to place the accused on leave until they can sort things out. I wouldn't say this is any indication of guilt.
For any parents, beware of any adult who puts himself in a situation to be alone with a kid. Kids should always be taught not to be put in a situation where they are alone with ANY adult - not a teacher, coach, scout leader, or clergy.
I coached CYO and AAU for years. I was taught early on not to even give a kid you knew an innocent ride if he was the only kid in the car. I NEVER touched a kid below his shoulder, and got in the habit of tapping them on their head when they did something good. If I wanted their attention I put a hand on their shoulder, or high fived them after a good play.
It's a sad commentary, but kids should never be alone with an adult who isn't a parent or close relative. Even that leaves open the possibility of a predator relative preying on a kid, and I can honestly say that my kids have never been alone like that with a male relative, even if my guard would be down in that situation.
Based on the story, there seems to be too much detail for this to be fabricated. Victims carry a lot of baggage for a long time, and the PSU story probably gave them the courage to come forward.