If you cant survive going to a bush then you shouldnt, simple as. Adc should finish current wave if pushing to help you.
Thats like asking, if they have 1 down so we can 4v5 them then ive i 1v4 them is it my teams fault? Going 1v4 is your fault, and your team not fighting them is their fault, they are two different things and two different faults.
You either go together for ward or you dont if you are a squishy support that can get 1 shot by their jgler. If you are tanky enough or have the disengage capability then you can ward alone.
But if you are squishy and your and your adc doesnt help you after pushing the current wave then thats his fault, if you then given that situation decide to go facecheck a bush then thats your fault and can be deemed as int tbh because you know that your are potentially giving a free kill.