That's a gross mischaracterization. Democrats trust government as an institution but that does not mean democrats trust all government, it just means they think government can solve problems, as opposed to the republican projected view (though not actual view of their voters IMO) that government is inherently broken as a concept and should be reduced to absolute minimal size.

There's no inconsistency in trusting a democratic process to do mostly democratic things but thinking the lack of accountability in policing has had negative outcomes. The vast majority of democratic voters in america do not support "abolish the police' in entirety, but rather that reforms are needed.