Many individuals (and only for the sake of appearance) are in favor of allowing those calling themselves "independent" to vote in political party primaries. That is no different than allowing non-members of any organization to participate in voting, whether that is a corporation or even a church. It is doubtful if many (if any) would be in favor of that.
If these so-called "independents" want to vote in the primaries of any political party, they have the right to join that political party. Otherwise, the only thing they are doing is "getting a free in" without themselves putting forth any effort. To put it another way, they are the classic "deadbeat." If such people want to effect change, they should do what some of us ask others, when they begin to complain about things not getting done. That is, "Did you show up to do anything when things needed doing?" If the answer is "no," they are told (in a much more delicate way), that they don't have any right to complain). Another way of putting it is, "If you didn't show up, then shut up."
It is also a hard and brutal fact that how they define independent is not in the "free thinking" (intellectual) type of independence, but really freedom from any obligations and/or responsibilities, except those they believe they owe themselves and their personal or (at best) parochial interests.
Therefore, they are not truly independent, but slaves to their own selfish and self-centered concerns. What rules their entire lives is but "me, myself and I," one much too prevalent at almost all levels in almost all fields of endeavor.
If that were found in an individual, the label "sociopath" would (and correctly so) be attached to them. That same label can be applied to entire groups of individuals. While they may attempt to conceal it (even from themselves) by using noble and grandiose terms, the duplicity is much too easy to detect with minimal of effort.
There is an old saying, "Actions speak louder than words" and that is true. What is also true is that inaction speaks just as loudly and, in many cases, even louder.
Robert I. Laitres