You don't need to be able to do justice with your own hands to argue and defend it. Otherwise only soldiers could opinionate about wars, and priests could teach nothing about marriage. This is a silly argument, in fact it is a falacy, the argumentum ad hominem:
https://en.wikipedia.org/wiki/Ad_hominem
In fact it can not even be considered an argument, but only a threat and intimidation of the arguer
RE: Trump is a covert KGB agent, there is no other explanation for what happened ...