When I read your post, two things jumped out at me:
#1: John was writing about all extremists, not just on the left:
But if you want money for people with minds that hate
All I can tell is brother you have to wait
He was also saying that each individual has to change internally before thinking politically.
You tell me it’s the institution
Well, you know
You better free you mind instead
This song is anti-politics, not an endorsement of one side or the other.
#2: The Who attacked both sides of the political spectrum:
There’s nothing in the street
Looks any different to me
And the slogans are replaced, by-the-bye
The parting on the left
Is now parting on the right
And the beards have all grown longer overnight
I’ll tip my hat to the new constitution
Take a bow for the new revolution
Smile and grin at the change all around
Pick up my guitar and play
Just like yesterday
Then I’ll get on my knees and pray
We don’t get fooled again
These are strong anti-political messages, and as far from being “Conservative” rock songs as you can be.