Not even close to 200 million votes for witnesses,

Correct, which is why it's important that people vote.

and it is likely that it never will.

Regardless, it is important that we try.

Similarly, 75 million is 20% of the total supply of STEEM, not SP.

I know. 200 million STEEM is the size of the vesting fund.

And also similarly, it is very unlikely that anything close to 350 million total STEEM will ever power up as SP.

Unnecessary.

75 million is 37.5% of the currently powered up SP, not 20%.

I know.

37.5% is easily more than enough exercise total control given that not all of the powered up SP votes.

Yes, given that.

In theory, in some extreme hypothetical, 75 million might not be enough for total control, but in reality that is very unlikely.

When someone comes at you with an axe over his head, do you just calmly take a blow to the head, or do you do at least try something?