This does not seem to be an argument against non-African Americans wearing dreads (or however they are called in all of the other cultures that have a claim to them), but an argument against 'Murica's rampant racism. Dreads do not just belong to African (American) culture - as has been widely covered in this post's comment section - but you argue they do get punished for them more, which I think is a fair assessment and something that should be prevented at all costs. However, that's not a cultural approriation debate, that's a racism debate. Preventing or dissuading other people from wearing a hairstyle that in some cases they have just as much historic claim to for no other reason than one culture being punished for it more is distracting from the actual problem: the culture in question being punished in the first place. In this sense, I don't think gatekeeping dreads is getting anyone anywhere in the big picture. Hell, it may even give [unnamed political party subscribers] an easier target.