If the assignee field is useless to you as you describe, then hide it in all the field configurations.
Or you can dig into some code and remove it - it's not a change you can make in the UI.
I'm really not sure you want to do this though - the assignee is an integral part of any issue tracker, as it tells you who is supposed to be currently responsible for dealing with an issue. Just my 2p worth though.
assigner option create confusion for the user
all issues are assigned to a middle office group that belong to all groups, so when a user filter by group, the sames issues appears when he choose each group, so he believes that the filter does not work so there is no need to keep the option
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