@coolrox95 It's just the game's programming. I recommend stepping just outside of town and letting the robbers come to you, and fight them one at a time, stepping back inside the town when needed for ammo, water, etc. Once you buy a mule, you can outrun most of the robbers unless they are already ahead of you.
You guys should try JamLegend if you like this game, you can hook up a guitar to it and everything on your computer -- I just started it and it's suprisingly fun http://www.jamlegend.com/refer/li/1097833