Taxes are not an ideological debate, no matter how much you might wish it were so. They pay for things the government does, much of which people are in favor of. Tax distribution, tax rates, etc, are topics for reasonable debate. "TAXES ARE TEH EVIL!!!!!!!!!!!" is just stupid.
I think that's overstating the point - there is definitely an ideological part.
Choosing where to aim the rocket to put a man on the moon isn't very ideological. It hits the moon or misses.
But there is a wide variety of choices in things like tax and wealth policy which can 'work' by someone's definition - when we have had the highest levels of 'bad' policy, like the gilded era, there were people defending that because it was fine according to their ideology. You couldn't point to a 'practical' issue and change their mind.
Heck, the same with slavery.
If we overtax most Americans to the point of driving them into the ground while not taxing the rich while they gain ownership of everything - there are people who will say that's great, making it more an ideology issue than a practical issue why that is a bad choice. You can cite statistics all day to the advantages of not doing that, but some will prefer it anyway, because of ideology.
Ideology is beating those practical issues every day. Ronald Reagan spouting a platitude of ideology persuaded voters over the practical issues.
Him 'joking' he was terrified of the government persuaded many people more than the benefits they got from good government.
You're right about the extremes, but ideology is still a very large part of the issue, and what we need are people with a better ideology, not brainwashed with propaganda.
When I choose a good government program over a tax cut for billionares, there is a part of that that is ideology, not just 'practical'.
It's largely about choosing whether we want a society with a prosperous middle class, a good safety net', less poverty, and many other things.
Some of our billionares - the Coors, Scaifes, Koches, Olins et al - do not want that. They have a bad ideology IMO, and the means to spread it.