Violence was a thing before guns existed. If I got stabbed I'm not going to think, "Thank goodness I wasn't shot." I suppose I'll have plenty of to think about it while waiting for the cops to show up though.
Cherry picking and a lack of controling for confounding variables is an issue when people try to make the claim you did. There is also a lot more going on than just gun laws. When normal people don't benefit from our GDP it really isn't a good benchmark for comparable countries. When people have a lack opportunities or lack social programs there will probably be some social problems.