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Whether you get injured in Jiu Jitsu is largely up to you. Very rarely will someone intentionally injure another person. More often than not, injuries come when people try to avoid something and make the situation worse. Which is why you have to be in control of yourself during rolls. If you're injured and decide to go wild after somebody, you can't get mad when your injury worsens. The same can said for trying to roll like you're 22 when you're 45, the wheels will fall off. Most of the time when someone is better than you at jiu jitsu they will match your pace, so if you go out and try to kill them, they will give no quarter. If someone is training wild you don't have to train with them, but also make sure you aren't the wild one.