The phrase "good rationale" means having a logical and valid reason or explanation for something. It implies that the reasoning behind a decision, action, or belief is thoughtful, sensible, and well-justified. Full definition
There is a very good rationale for positing that past performance can identify funds likely to outperform in the future. (thedigeratilife.com)
There is good rationale as to why the bond markets are in the position they are today; compressed spreads are the result of low rates coupled with strong demand out pacing supply for yield assets. (indexologyblog.com)
Selling at the time probably made sense and he had very good rationale for doing it, if that is the case, which I suspect it probably is, I wouldn't look at it as a failure. (basehitinvesting.com)