I think this surplus debate is a bit of a straw man.
People who are against it are against it for the wrong reasons. All in all police having more capabilities is not a bad thing. However, it can be argued that the maintenance budget, etc. that now must be spent on MRAPs or NVGs is better spent on other community outreach or whathaveyou programs.
The real issue with paramilitarisation is officer conduct, not what kind of gun they're using.