Your reasons don't seem based in evidence. You're saying that Trump's wound was 'self'-inflicted, yet there is evidence that multiple bullets were fired at close proximity to Trump, some hitting and even killing an innocent bystander. This evidence supports disproving that Trump was not the target. If Trump was the target, then he could not have known about the possibility of inflicting such a wound upon himself, except perhaps by opportunism, which would require he had this hypothetical 'wounding device' you speak of on hand for quick access, which becomes considerably improbable.At the same time, I am not asserting anything, I am only guessing and I have reasons for this.
Your logical thinking appears to have collapsed with regard to this situation, which I find somewhat interesting given your astute take on the Ukraine-Russia situation in general. Why should you think this way about this situation, which is a US domestic political situation that has nothing to do with Russia, thus suggesting even greater emotional distance from the subject in your case?