@simon
The other things you mention have all been changed through the democratic process. That is the only way change can and should happen.
I take it you agree that policing will be much efficient if it is combined with better laws.
"changed through the democratic process" What you call the democratic process was a lot of protest like the suffragette, it took them almost decades for women to get the right to vote in the UK. They had to fight for it.
Often times, people have had to fight for their rights. Civil Rights movement, they had to fight for it. Apartheid it South Africa, they had to fight for it.
Interracial Marriage in the US, they had to fight and they went all the way to the Supreme Court. Once the law was found to be unconstitutional, policing became much easier. Leave and let live
Effective policing requires rethinking the laws of the land