Taiban, if you do not have the evidence to back up your claims, you have two options:
1. Retract your previous claim. No one will mock you for that. We make hypotheses all the time and if the evidence isn't there, then retracting a claim is part and parcel of PLA watching.
2. If you choose not to retract your previous claim, then all that you can do is to agree to disagree with the others who are challenging you on your lack of evidence. But if you go this route, then you will be remembered for it.