It's more that conservative rhetoric and argumentation is largely based on pathos. It appeals to emotions to a large degree than leftist rhetoric, in other words, which makes it more difficult to reiterate in a neutral and non-biased manner. And it's not that other ideologies don't do this as well, but rather that they to a larger extent appeal to the ethical side of doxa rather than the moral side, as well as that just being the conservative way of arguing as that is what appeals to their target demographic. A conservative could be telling you, in hard numbers, these are the bad things about this issue and the consequences for the society we live in, just as well as a Democrat can, but they tend to opt with instead framing it as "you should fear this, and if you support it you should be ashamed, because that's immoral", partly I would argue because they know that the majority of people just wouldn't agree with their conclusions in regards to the former and the latter as such delivers better results (though I have no proof of that).