You mean the good people who didn't want anyone killed, and killing someone because they have no use to you is still an evil act. Plus he killed criminals so people would accept him as their god, not because it's a good thing to do.
No, as it was getting to a point where people were telling Light to kill someone for minor things, instead of being a criminal. The possibility of being killed for a minor thing you did can cause fear.
Oh I was meant to put in the the killing people who was no longer any use for him was part of the evil side.
Oh ya I was looking back at the first volume of the manga and just remember that Light did say in his speech to Ryuk he said, "And while people who obviously deserve to be punished are dying of heart attacks...I'll gradually be killing off immoral people who harass others, through illness and accidents. Even that will eventually be noticed by the idiot masses. They'll realize they'll die if they don't change their ways...I'll make a world inhabited only by people I decide are good!"
So yeah I believe Light was doing more good then evil if he want the world filled with only people he decide are good.