Re: "Let's make America reasonable again !"
"Roosevelt's New Deal policy is said to have been pretty reasonable (very few of us will have direct experience, as this was back in the 1933 to 1938 timeframe). "
So 7 decades ago.
" protecting West Berlin during the cold war."
That would be the Berlin airlift of 1948.
However as a practical matter military planners gave West Berlin a survival time of hours should WWIII start. It was surrounded by East Germany. For some reason it also meant residents were exempted from compulsory military service, which attracted a lot of young people to the city.
More recently the US has been home to $T (1x10^12) deficits, repeatedly dead locked decision making in both houses (because of a system that ran district councils in the 17th century does not really work for the biggest economy in the 21st), multiple bank bailouts and multiply misguided foreign invasions, at least one of which blatantly lined the pockets of one former SecDef.
Let us not forget the infection of the US Legal system that is THE PATRIOT Act and the continual running of the Guantanamo Bay prison, most of whose inmates were never subject to due process .
(if you were offered a bounty equal to 2 years pay wouldn't you be thinking about who you knew who looked a bit "suspicious"? Especially if you had a friend in the local police force to do the arresting.) as well as the vast personal data hoover that is the NSA, which shows no restraint and no signs of being restrained by any outside body and which has already caused the DEA to lie about its sources since to admit they were the source would admit it spied on US citizens.
I haven't gotten onto the assorted collection of SEL's that is the Religious Right who will no doubt continue to ensure the US has the highest rate of teenage pregnancy of any "developed" country.
Reasonable? to misquote Rorschach "I'd expect more sensible behavior from a Romanian orphanage full of retarded children".