"the rationale being" is a correct and usable expression in written English.
You can use it when expressing a cause or reason for an action. For example, "We decided to close early today, the rationale being that a severe thunderstorm was expected later in the evening."
(The rationale being, they are not forbidden by God).
The rationale being that some internet, albeit restricted, is better than nothing.
The rationale being Atg3 and Atg7 have surface accessible catalytic cysteine thiols that bind to LC3.
Indeed, this problem is the rationale being advanced by companies trying to broker space over the Internet.
The rationale being that Greece would rather pay off these investors as opposed to having to fight them in court.
The rationale being that football's benefits to its local community, like art galleries and playing fields, go beyond what is reflected in ticket stubs?
The post-war nationalisations were underpinned by an ideology of technocracy – the rationale being that State owned industry should be run by State employed experts.
The rationale being that one of the substrates for the enzyme is 2-oxoglutarate and this compound can be formed from glutamate in a single reaction.
The campus decided to proceed with the garage, the rationale being that because of the high cost of seat licenses for football, having convenient nearby parking would induce lagging sales.
One N.F.L. theory that outsiders have found slightly more plausible is that the league's players are probably less susceptible to brain injuries — the rationale being that more-susceptible players would not have lasted long enough to make the pros.
Third, increase the return on the training investment by persuading employees to work voluntarily on stretch assignments, the rationale being that they will gain skills that will make them more valuable in the future.
