I think one of the important points is the description of some as inflexible. This idea of a single issue focused litmus test for tea party or conservative candidates is a major failing.
Take the pro life groups as an example. Their sole focus is abortion issues and unless a candidate follows their path lock-step, they take their ball, their money, their vote, and go home. A person could have great leadership skills and a whole host of other qualifications, but they are dismissed and not considered unless they meet this groups singular need. Even worse, their groupthink mindset shuns and shames others away, even those with similar political beliefs. You get labeled and dismissed as the opposition.
This behavior, actively in display here in FR, is stupid, childish, and cult-like. It is the path of an extremist and inevitability leads to isolation and political failure. Much of the Lefts success politically is owed to their ability to seize on issues like this and exploit their oppositions unyielding stance. Abortion, legalization of cannabis, and gay marriage are good examples of singular issues that keep zealot voters home and allow Democrats victory.
Just my take in it.
Your take is pretty much founded on the notion that killing human babies is not worth putting even extremely minor effort into opposing.
It is not based on that notion plus something else.
You can’t get there any other way.
To you, defending unborn children is “stupid and childish.”
It should never get in the way of you getting what you want.
Having taken it down to its components, your stated position fails to convince.