P2P can actually be used safely, but its use places an added burden on the user to more comprehensively analyze what is downloaded prior to running it, and/or putting mitigating procedures in place (such as limited rights, a VM, imaging etc).
It's not for a clueless user. I'm maybe a step above clueless, and have managed to avoid infection, so it's not that difficult.
Now with a live streaming app., I would think a sandbox (VM) environment would be just the ticket.
Re the original threat: MBAM is an extremely capable AS, I would also recommend an antirootkit scan, and/or an additional AS scan with, say, Superantispyware.
This thing installs using rootkit technology, according to F-Secure.