I can think of a few reasons:
(1) anxiety
(2) doctors rushing patients
(3) spouses and friends putting pressure on patients based on what they know about
other cancers
(4) limited options due to health insurance plans or family obligations
(5) ignorance of other options and what the data show
(6) patients not taking the time to do their due diligence, which may be related to any of the above
Many patients never get further than the first urologist they meet. They are scared, and have all kinds of baggage, some relevant, some irrelevant. When someone with knowledge, experience and in authority is basically saying, "This is what you must do or you will die," many of us take heed and do as dictated.
In 2010-2013,
a registry showed that surgery was chosen by over half of newly diagnosed PC patients, regardless of risk group, but radiation was chosen by less than 20%. I believe this is occurring because most patients never get past the first urologist they meet with.
Anxiety and sadness are very natural reaction to stressful circumstances and bad news. For most of us, those feelings diminish in intensity over time. Those emotions evolved to protect us from immediate danger: the tiger is at the gate -- better run or shoot it now! However, those same emotions may interfere with decisions that require a lot of thought and deliberation. As the adrenaline levels go down, we think better. It is always a good idea to wait as long as we can to make decisions requiring careful thinking. (BTW- there is a wonderful book about
this that I highly recommend:
Thinking, Fast and Slow by Daniel Kahneman) One can also learn how to deal with ruminative thoughts and emotions in a different way through the practice of Mindfulness.