The phrase "similar rationale" means that two or more things have the same reasoning or thinking behind them. It suggests that the logic or explanation used to make a decision or support an idea is comparable between these things. Full definition
Similarly, radiation is the only way you can get rid of energy going out to space by similar rationale. (realclimate.org)
Failing instances of TKAM, other books that have been removed with similar rationales (e.g. Huckleberry Finn) would be useful. (politics.stackexchange.com)