I don't see how the number of people 'denying responsibility and lying' depends on the exposure to government propaganda saying that Russia is doing good and justified thing right now.
If you believe you are right and what is contrary to this belief is only a fake, you don't need to lie and there is no responsibility for something you didn't do.
If you believe you are right and what is contrary to this belief is only a fake, you don't need to lie and there is no responsibility for something you didn't do.