I've heard plenty of reasoned arguments against those things. Here's the problem: they weren't given by Trump supporters. They came from moderates, or in some cases, from Marxists.
Trumpism isn't just opposition to what Fox News says the Democratic Party supports. It's the belief structure that convinces people that "open borders" is even on the table in modern politics at all (it isn't). If you think that "open borders" is more likely in the next two decades than the country being destroyed by an asteroid impact, you're already in the disinformation hole.
That's not true at all for most Trump supporters. If you have trouble finding answers to your questions I can give them to you. I won't call you a cuck and will engage in a proper debate. Even though I don't subscribe to all of Trump's policies I'm a right winger and a conservative. Another point to note: I don't subscribe to all of Trump's policies because the right wing in America is different from right wing in my country in many respects. But there is sufficient overlap to be able to say I can agree to many of the conservative points in US politics as well. So if you have questions regarding my ideology fire away and I'll try my best to answer.
We did, but when we challenged their fundamental assumptions about the world or proposed alternatives in earnest reasoned debate and discourse they called us “cucks” and what can you do at that point?
Yes, there are people who have been left-behind and find themselves economically disadvantaged by the changing world (e.g. The rust-belt) - but that’s not the basis of “Trumpism” - Reactionary right-wing politics draws on that group but it isn’t the cause nor basis for it. Remember that Trump isn’t really that popular amongst actually poor people - he’s popular with people who grew up in an environment that promoted what we now call /toxic individualism/. And America has a long tradition of it.