Do you buy that the USA can not have safer transit because it's too big and unique in its layout?

I have no idea what "safer" has to do with anything. "Too big and unique in its layout" is only part of the problem. Mass transit works where the population is dense and going in predictable directions at predictable times. My son lives in a big city and within walking distance of a train station. There are trains at all hours going to the airport and the hospital.
I'm in the middle of nowhere and it's 8 miles to the nearest gas station and closer to 12 miles to town. There's maybe a dozen families living in this community, some work in the town to the north, some work south of here. Some work in the day, some at night. Most days I don't go anywhere, but if I do it could be at any hour and in any direction. I may not even be going to town, it's highly possible I'm headed to another remote part of the county, and also highly likely I need to haul something with me, or I'm picking something up and hauling it back here. There's no logical way to arrange public transportation for a dozen different people headed in a dozen different directions at a dozen different times of the day. And this community isn't even that remote and certainly not unique. The town south of here has almost no jobs, so those people are traveling somewhere, possibly to the town north of here or maybe into the next county south. I spent 14 years driving to a job an hour away, so 120 miles a day, five days a week and sometimes more because that was where I needed to go to find work. sometimes I made it in around 5pm but there were times I made home between 10pm and midnight.

The question sounds as if it was written by someone who has never been in the U.S., or at the very least never seen much of it and has no idea how spread out it actually is. Big cities typically do have some form of public transportation, some better than others, but there are many many small towns and remote communities where there's almost nothing. There are small towns without grocery stores, or hospitals, and very few jobs. That's the reality many of us live with. It has its advantages and we really don't see it as a problem that needs fixing.

Americans love the idea of freedom
A car gives you freedom

Ya no public transportation for me. I like my privacy and freedom. Also, as many others have said, most of America is not nearly as densely populated as Europe or Japan, so mass transit makes zero sense.

Its basic transit geographic is a last century response to a military strike from the communist russkies. Its designed latiduially bc of location accesses.

Mass transit is also a tool of government evil. You know what Stalin and Hitler used mass transit for? Especially the train systems? Exactly.

Things are spread out too much. Where there’s a dense population it can be very efficient to have several forms of public transportation.

Lol. No. That is total bullshit. Excuses for why the US has been lagging behind for decades.

No, I don't buy that.
The reality is that we don't WANT mass transit.
Well, in the cities is fine - but not between cities and/or states
The only ones that seem to want that is politicians
who I suspect are paid by construction companies,
and they are ALWAYS over budget.

Yes what we need are less people but I am ambivalent about it because I am a firm believer in babies. We need more babies goddammit to hell!! sorry. But we need billions more, even trillions! Let's go people, let's make some fucking babies!! sorry.. Go Trump! Pussy Grabbers Unite!

What does the size of the country have to do with transit safety?

We have safe transit now. What are you going on about?