The effect is just as relevant after they have been in circulation a long time. Afterall the goal is to reverse those lies and seek a state of truth again no matter how far gone it may be... You only do that by dismissing the lies, not amplifying them, and amplifying the truth to restore sanity.
@freemo @LouisIngenthron The difference is if it is established, ignoring it will not make it go away anymore. You need to take action or accept it then.