You need to read the fine print. Although the graphic you linked to claims that these things "may increase" violent crime, when you click through to the "supporting evidence", it turns out the evidence for that is "limited".
Also, the pages talk about "homicide", but that term, at least as it's usually used in such general studies, includes justified self-defense homicides. So if total homicides do in fact go up as a result of these laws, that could be because criminals who would have gotten away with their crimes before the laws were passed were instead killed by their intended victims in self defense. That's not a problem, it's exactly what the laws are for.
Also, the pages talk about "homicide", but that term, at least as it's usually used in such general studies, includes justified self-defense homicides. So if total homicides do in fact go up as a result of these laws, that could be because criminals who would have gotten away with their crimes before the laws were passed were instead killed by their intended victims in self defense. That's not a problem, it's exactly what the laws are for.