Anons, here is a straightforward idea for redpilling.
Ask a liberal - How is it acceptable for the FBI to have a secret society that is plotting to kill POTUS?
Remind them that Mueller's investigation is nearly ready to come up with results, that Congress can impeach POTUS if there is any crime, etc. There is a legal avenue to get rid of POTUS if he has indeed committed a crime. That is the rule of law and that is the American way.
On the other hand if it is OK for the FBI to kill POTUS, then it should be OK for them to kill and Congressional rep or Senator or member of the executive or senior bureaucrat, etc, etc. etc.
If they simply will not redpill but agree that it is OK for the FBI to kill POTUS, then ask what else is OK. Sex with underage children? Satanic ritual murder? Cannibalism? Embezzling pension funds? Rigging the stock market?
The goal on this last is to get them to think of these crimes and to pass judgement on the crime, not any specific perp. And we all know what will eventually come out in public.
On the other hand, if they are law abiding and do not agree with assasination, then get them to agree that FBI people who have gone too far, need to be dealt with under the law, fired and charged. If they agree to this, they are ready for the redpill journey