The notion that a vote for a 3rd party "dilutes" the vote is rooted in a fear-driven mentality rather than in Democratic principles.
Its neither. Trump or Harris will win. They both have flaws, but one of them has significantly more including wanting to be a dictator and removing the right to vote going forward. The notion that a 3rd party vote dilutes is based in strategic voting. We have a system that benefits only 2 teams, refusal to work within that 2 team system without first erecting groundwork to actually have a chance at winning is either: 1) removing votes from the main candidate of those 2 teams you'd rather see prevail over the other or 2) not voting against the candidate you'd most like to see fail. It didn't matter which of those is the case, they are both diluting.
It assumes that votes are owned by the two major parties which they are not.
They are. The system is erected such that only a member of one of the 2 major parties will actually win the presidency. Therefore only votes for them actually matter.
Our electoral system is supposed to represent the diverse views of the electorate, not just those of the dominant parties.
It's not. First past the post only helps the dominate parties. They are the only ones that stand a chance at winning and they are the only ones who actually win. This results in a majority of the electorate compromising somewhere to settle on a less ideal candidate. Ranked choice voting and proportional representation with a parliamentary system of government is significantly better at representing the diverse views of the electorate.
In the end, I personally refuse to be intimidated into voting against my conscience.
That's fine. Your preferred candidate won't win and you will not be contributing to choosing a candidate that more closely aligns with your views than the other.
Democracy thrives on diversity of thought.
No it doesn't. Democracy thrives on having access to the polls. Outcomes of democracy thrive on them being educated, voting critically, and for their best interests, and having proportional representation.
Some people believing women shouldn't have control of their bodies, that they belong naked, standing in the kitchen without the right to vote, some people believing women should have autonomy and suffrage, some people believing women should have autonomy, but not the right to vote, and some people believing that a man should have 1 vote for him and all his dependents are a diverse selection of thoughts. But those thoughts and the people that hold them are not causing democracy to thrive.
All told there are tons of problems with our electoral system from the EC to paid ballot access for minor parties, first past the post, unlimited money, 2 year campaign cycle, the people that actually get nominated, strategic drawing of maps, culling voters from registrations, states leaving ERIC, and more, but those problems benefit a 2 party system and refusing to participate in that does not benefit your cause. What voting a 3rd party does do is get them closer to the 5% cutoff for access to federal Presidential Election Campaign Funds in their next election and signal a vehement opposition to some policy. However, that signal is easily ignored with such a low turnout.
So how do you get a third party presidential candidate to win? By actually building a 3rd party first. Run candidates in local elections, get them on school boards and mayorships. Start locally, build a following and work up to state. Start winning an appreciable percent of state legislature seats and move on to congressional seats. Once the American people are familiar with you as a "party" who actually is involved politically and demands a significant amount of real-estate on the hill and in their states and not simply as a "fringe party" taking a crap shot at power they will start to view your party as actually having a chance to win the presidency, they might actually vote for you in no small part, and you eventually can work your way to an actual victory.
Vote for who you want. If it's not one of the main candidates that may be ideological and even admirable, but right now it's ineffective. I'll be voting to reduce the chances of Trump winning office, because I actually want my vote to matter in future elections.