The problem of crooks getting re-elected is quite complex. You cite critics of PR saying crooks can sneak in on a party list -- but they can only do that if their party wants them back...

In some cases in first past the post, an individual crook may not be wanted by his/her party (bad image), but run in defiance and win because of local popularity (which you can buy, especially when you've represented a district for many years...) There have been cases of this kind in France on both sides of the political spectrum.

So I don't see an advantage to either system on this point.

Another good diary, DoDo, thanks.

<tip> I think, though, that if FTPT means First Past The Post, it should be FPTP... ;)