For the same reason I avoid Springfield Arms products, Rock River Arms was in the same boat-- if you value gun rights i would say that, despite their attempts to cover their actions as companies, avoid RRA (and SA).

M&P10 is a great platform, +1 on DPMS as well.

I think even though most of us are S&W fans to some degree, there are other brands and types of firearms we have used or own that work great.