The "hubris plus gumption minus diligence" mindset can be frequently found among adherents of all sorts of ideologies. If anything, reactionaries are likely to shy away from solutions that no one has ever thought of before in favor of solutions that they think have worked before.
“They think” is the key word here. It’s usually informed by woefully misinformed understandings of history and science. That’s what makes it “gumption-based” rather than “evidence-based.” This is what differentiates the reactionary from the conservative.
To some extent I agree with you, which is why I wrote "they think". Most people's ideologies are based on misinformed understandings of history and science. Reactionaries are probably more likely to be misinformed than conservatives and, in general, other kinds of moderates are. But I doubt they are more likely to be misinformed than progressives are. I think maybe in general, moderates are more likely to be well-informed than extremists. Gumption-based approaches are common among progressives and reactionaries alike. Maybe even more common among progressives, although I wouldn't put money on it.
Is a concept like 'feeding babies is better (i.e. cheaper and healthier) than jailing adults' progressive and so probably based on misinformed understandings of history and science, or is it not progressive?