So instead of regulating lobbying, it would be easier to eradicate all potentially corruptible people from the planet.

If you think regulation is magically excluded from your own logic, you need to get another think.

"Quid-pro-quo bribery isn't the issue. The corrupt politicians who accept bribes are the issue."

This isn't how we do legal policy. We wouldn't say "all bribery laws are gone, we'll just make sure that we don't have any politicians that accept bribes some other way."

Well, you're kind of right. Bribery disguised as lobbying is the issue, not lobbying itself.

The politicians corrupted because of the lobbying. How can we put them in separate basket?

They're not corrupt because of lobbying, they are already corrupt and take advantage of lobbying.

There are things that could be done but the people in office making the laws are not interested, and the population is too apathetic/indoctrinated to make the correct choices.