Policy decisions are important, granted. That doesn't mean that conversations about policy by people who are (generally) relatively ignorant and who don't make decisions or have much influence over the people who make decisions are important. Insofar as they are important, it is when they are converted into activism, which does have the problem of prioritizing your side winning over truth or rationality related goals.
Politics, that is, the actual process of running government, making laws and regulations, etc, that is important. Talking about politics as a spectator doesn't seem very important.
This is a very aggressive approach, but there are legal ways to change your tax status that can have a more positive impact. For example, you can time your giving to maximize charitable deductions and use that to give more.
Suppose you make $200K annually and give 10%. If you give $20K p/year to the charity of your choice, then there is a good chance that you won't be able to claim a charitable deduction (the standard deduction for a couple is $27,700--so you would have to find another $7.7K in itemized deductions and even then it is only any additional dollars that would be deducted).
However, if you instead put the $20K in an index fund growing at 6% you'd end up with around $110K after 5 years. Give that to charity and you can deduct $96K+ from your income. That is tax savings of over $20K, which you can use to increase your giving.