Vigilante warfare is very dangerous. What happens when there is a ceasefire or peace agreement, and some vigilante violates it? What if a vigilante unwittingly interferes with an actual operation by their side (e.g., by exposing an exploit their side was using), or ignorantly destroys a resource the good guys needed? What happens if a vigilante crosses the line and conducts what the Russians think is an attack, requiring a military response? For example, what if a vigilante finds an exploit at a Russian nuclear weapons facility (maybe without even realizing what they are attacking)? NATO intelligence agencies can claim it wasn't them, but of course they would - why would the Russians believe that?

Warfare is coordinated, controlled violence, not indiscriminate violence. The vigilante stuff is very dangerous and probably achieves little. Leave it to the NSA, CIA, etc.