do people that already had covid 19 need a vaccination?

Maybe. They probably need it because it's new and we don't know too much about it. If it's treated they still might need it so they can't get exposed to again even though they're lives are practically ruined.

Probably. There are cases of people getting it twice and no one knows how olong you're good once you have had it.

they probably do

Several people have had the disease twice, so it's quite possible that some/all immunity against it is only temporary

Yes - natural immunity to COVID 19 for those who've recovered wears off quickly

We have no idea how long immunity lasts with for people who had covid and we have no idea how long immunity lasts with the vaccines that have so far been announced.

the Pfizer drug gets you sick twice and may only provide immunity for 3 months = what a stupid option that would be.