If you had the time and resources, wouldn't you try to affect change in government? It's not fundamentally any different than showing up to your city council meeting to get housing developments approved/blocked, for instance. Moreover, most people don't think of themselves as bad people, so they probably legitimately think they're doing the Right Thing™, rather than being some sort of cartoonishly evil villain trying to ruin society by starving government of funding.
This is going to be hard for the politically inclined to understand, but no, it's simply not the case that everyone everywhere is preoccupied with finding/creating legal ways to push their will/preferences onto other people.
I'm also not sure who you're suggesting is ideologically blind. All I'm saying is that given resources like a huge pile of money, many would not wish to use that money to coerce others or otherwise change their local political situation to better suit them. Instead they'd use those resources to increase their own resilience, i.e. simply choosing to leave the neighborhood or situation that was bothering them instead of trying to change it and assuming their own interests are the best and most appropriate ones for everyone.
As the parent is pointing out, everyone thinks they are doing TheRightThing(tm) when they collect/use power to force their views on others. Instead you could have power/wealth and just choose to not fuck with other people. That's not being ideologically blind, it's just an ideology that says, you know what, even my strongly held opinions could be wrongheaded, and maybe I shouldn't be using my arbitrarily acquired wealth/power to steer anything besides my own life.
It's only a viable option if you trust your political system to function when your back is turned.
You can either opt out, or you can wade into a corrupt system and start finally enjoying your ability to join in on all the corruption. In the 2nd case, what's the plan moving forward for an ethical actor really? Using money to bribe politicians into stop accepting bribes? Should we bribe citizens to stop electing politicians that accept bribes? If you don't want money involved in politics then I don't know how you start to fix that with money.
Not for my own benefit, no. Just like I don't base my votes in elections particularly on my own benefit, and never have.