Of course griefing is a problem in the beta. As beta testers our job is to siscover flaws before the general release. Right now there is no way to deal with griefing and it is a huge issue making public servers unplayable. I'm sure that the developers are aware of this and are working on fixes such as banning and kicking as well as balancing fire and how players interact with eachother. Instead of complaining about griefers try comeing up with constructive ideas to deal with griefing and make the experience better for those who play the game in the future.