In my experience & with everything I've read it's rather difficult for autistic individuals to lie unless under duress. That said, some try extra hard to fit in with culture and if the culture is obsessed with weapons, then they might pretend to also like them in order to be accepted.
Another possibility is that they are perceived as lying. Most of us have a great difficulty with language. Societal misuse and reduced capacity to command well spoken english (for example) will compound the issue. If I already have a difficult time understanding what words mean, or if similar sounding words are muddled up in my brain, or even if I am slow to work out how to construct sentences properly AND there is a lack of respect for the pragmatic and concise use within society around me, I may appear as though I am 'lying' due to an impaired ability to structure reasoning coupled with constantly using words out of context. This was me at 25. After years of delving into philosophy, theology and daily intake of well established journalists, I've emerged 20 years later with a better vocabulary.
If they are autistic, help with language and exposure to the arts, judo, perhaps rough camping even, might help.
If they aren't autistic, this would fall under neurotypical behaviour possibly inching toward sociopathic.
Autistics feel grounded when they feel understood and connected. Sociopathic behaviour is about domination and it's a whole different set of rules as they're already connected to society and desire to feel unique, dominant. You cannot be both.
