Yes - this is activism at it's core... and it is "news" to many that know too little about how they can kick some real butt in their own backyard.
If we allow RINO's to waltz right into the party when we could have exposed them or driven them out of power with a better candidate, then we have not been 'aggressive.' We've been delinquent.
Your party is an open association. You have no say over who is in your party, intrinsically.
It's as if you lived in a big house on the edge of skid row, one in which you had a big sign in the front yard saying, "Anyone who wants can live here!"
How long do you think you'd want to live in your own house?
The very nature of the way the Republican Party is constructed made its demise inevitable. It took me many years to figure this out, but once I did figure it out, the choices about what to do about it became very clear.