I think it is highly unlikely the government are trying to push down bank share prices to buy then cheap! Thats the last thing they want!
I think the government are sh8tting themselves and desparately looking to restore stability!! Oh for a week when the markets only move 1-2% like the good old days!
The pref capital injections has been used effectively in banking crisis in the past. This sort of MASSIVE state intevention is always a necessary step to recovery. Extremely unpleasent for all involved but will help avoid financial collapse. Will not help avoid a severe recession though.