Voting for Random Minor Party Candidate Number 12 is doing zip to change the system. If it's giving you a warm fuzzy or a sense of accomplishment, then that's fine, but that's all it's doing.
Work to change the system in the long-term, but don't throw away the short-term.
In a way you are right.
(from wikipedia) In 1988, the League of Women Voters withdrew its sponsorship of the presidential debates after the
George H.W. Bush and
Michael Dukakis campaigns secretly agreed to a "memorandum of understanding" that would decide which candidates could participate in the debates, which individuals would be panelists (and therefore able to ask questions)
Hence the Committee on Presidential Debates was formed.
That was in response to growing pressure from 3rd party candidates and the two parties that sought to retain their level of power, wealth, influence, and control over politics and indeed the country. They then upped the magical percentage to get into their closed party debate format to 15% for 3rd party candidates.
So... If you think the two party system isn't rigged, then I call bullshit on your response above. If you want to change the system, you have to allow people their voice and if that voice is a 3rd party candidate then so be it. This election cycle we have two turds running for president and it is VERY obviously the nature of the rigged system of debates, the questionable tactics of the DNC with the Sanders campaign and ongoing collusion with the media to enforce the two party system and force these candidates down our throats.
As many here have said, voting for a 3rd party is indeed a choice and probably represents the vote of someone not stupid enough to be polarized by the media to vote for Hillary or Trump. I'll be voting 3rd party this year and screw anyone that suggests I'm throwing my vote away. Screw anyone who suggests to me that voting for Hillary or Trump is the "moral" or "honorable" thing to do (Yes, that is what shills for Hillary are saying).
You are not going to change the two party system. You just aren't. It has had decades to become corrupt, decades to build in it's protections.