The Vorcha may never advance to the stars or develop artificial life themselves but they can tell others about the Reapers so they are effectively guilty by association.
I wouldn't put it past them to intend to deal with the Yahg and the Raloi before they were stopped either.
I know the wiki's not the best source, but it does say, "In 2186 during the Reaper invasion, the raloi delegation withdraws from the Citadel. Unwilling and unable to fight the Reapers, the raloi decide to isolate themselves on Turvess and destroy any satellites and observation equipment in orbit around their planet. They hope that the Reapers will see them as a pre-spaceflight civilization and spare their planet."
I'm pretty sure the Raloi would be killed, but I don't know if I'd say the same for the yahg. We met one yahg who was intelligent, and another who was basically an animal. Liara even said that the Shadow Broker was probably supposed to have been someone's slave or pet.
I disagree with the "guilty by association" argument, because if that were the case, then the asari, humans and salarians would all be extinct for that very reason. They were around when the Protheans were.