This is a good point. In large part I think it stems from our fundamental dislike and lack of respect of political opponents instead of merely disagreeing with them. I think this trend started with George W. Bush and has only gotten worse with Obama, Biden, and Trump.CoH, you and I not agreeing about NATO and how to deal with Putin is no big deal.
However, what concerns me is our political parties and our political leaders don't agree.
Contrast with Senators Richard Lugar and Sam Nunn whose ability to work together to resolve differences as noted in this essay helped us to provide a common front during the Cold War. A common front which in my view no longer exists and gives a virtual dictator such as Putin a decisive edge.
The link above in part has this to say..
The senators’ collaboration extended into many other areas, when they had extensive off-the-record luncheon seminars on current foreign affairs in Nunn’s hideaway Senate office. Experts, including senior State Department officials and academics joined the two for frank, in-depth exploration of current issues. They also sponsored exchanges between the Congress and the new Russian parliament and co-chaired the Aspen Strategy Group, which met annually on foreign and national security policy.
They did not always hold common positions. Lugar favored NATO expansion to the East, while Nunn opposed it. So, they jointly organized a dinner discussion of the issue with leading proponents and opponents. Their differences always were tempered by their friendship and mutual respect.
I don’t see a fix on the horizon. The Democrats with Harris having a lead for 2028 can’t fix things, nor can Newsom. I think Haley could mend things, but she can never be nominated. In the final analysis, we are the blame. Too many enjoy resisting more than supporting.