“Is Putin more reckless than Truman?”
Yes. Putin is surrounded by people who are afraid to tell him when he’s wrong. Truman was surrounded by people he encouraged to speak openly and honestly.
One of the people in history that Truman admired was General Ulysses Grant who was noted for consulting his junior officers for their input and opinions prior to making decisions. Grant was not so proud that he would ignore advice from those around him.
Putin, on the other hand, can be seen on television humiliating one of his cabinet members who is clearly afraid for his life.
https://nypost.com/2022/02/22/putin-lashes-out-at-russia-intelligence-chief-in-viral-video/
The message here is that Putin only wants to hear what he wants to hear. That makes him reckless because he thinks he’s always right.