True Left

"are you saying that meat obtained through freeganism is more ethical than vegan food obtained through a food system that will end up benefiting the meat-eaters and other violence doers indirectly (economically or otherwise)?"

Yes. Freeganism is just another term for scavenging:

https://en.wikipedia.org/wiki/Scavenger

Scavengers are animals that consume dead organisms that have died from causes other than predation.[1] While scavenging generally refers to carnivores feeding on carrion, it is also a herbivorous feeding behavior.[2] Scavengers play an important role in the ecosystem by consuming dead animal and plant material. Decomposers and detritivores complete this process, by consuming the remains left by scavengers.

Scavengers aid in overcoming fluctuations of food resources in the environment.[3]
...
Ecological function

Scavengers play a fundamental role in the environment through the removal of decaying organisms, serving as a natural sanitation service.[8] While microscopic and invertebrate decomposers break down dead organisms into simple organic matter which are used by nearby autotrophs, scavengers help conserve energy and nutrients obtained from carrion within the upper trophic levels, and are able to disperse the energy and nutrients farther away from the site of the carrion than decomposers.[9]

Scavenging unites animals which normally would not come into contact,[10] and results in the formation of highly structured and complex communities which engage in nonrandom interactions.[11] Scavenging communities function in the redistribution of energy obtained from carcasses and reducing diseases associated with decomposition. Oftentimes, scavenger communities differ in consistency due to carcass size and carcass types, as well as by seasonal effects as consequence of differing invertebrate and microbial activity.[4]

"are you saying that Siddhartha and Mohammed were both freegans"

It is impossible to prove either way, but any other interpretation to achieve consistency would open even larger cans of worms. Basically, the choices we have are:

1) All their teachings against violence towards non-humans are fabrications. (And if so, what else has been fabricated?)
2) The teachings are real, but they were just grifters who themselves didn't believe what they taught. (Then why not teach something easier to follow?)
3) They were freegan.