Tiny Chat People

You can protect yourself without enacting violence, we already have a forcefield around our planet in fact.
One unfortunate fact is that we simply don't know what other people are capable of creating or what the conventions of battle in this game are and we'll have to learn quickly on our feet but it's not an insurmountable problem.
I think it will be very hard to completely avoid harming anything at all, but we can and should make sure we are minimising avoidable harm, otherwise we shouldn't win the game anyway.