You are right - people do suffer already. That does not mean that you should purposely act to harm people even more just because “that’s what happens”. Your actions are your own responsibility.
It's not just because "that's what happens", it's a deliberate act to discourage the Russian state from continuing in their current course of action, and it significantly less destructive (to an absurd degree) / will cause significantly less suffering than what Russia is doing in Ukraine as we speak.
