Apparently this idea is quite common amongst the young, and has been advanced to me by a Certain Male Member of my family, as well as being discussed today in DS's school. I'm kind of 
After googling it the suffragettes did do some pretty extreme stuff (a bomb plot for example) but only after decades not being listened to by Lloyd George and other stuffy parliament knobheads.
No righteous political movement has been entirely without some violence. South Africa had its casualties by the ANC.
Besides they didn't actually kill anyone.