The guy who shot up the club legally obtained a gun as he was a security guard and was trained. Also Florida doesn't have strict gun laws so that argument kinda doesn't work here.
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Disenfranchising persons create more problems and witch hunts. Did we not learn anything from the past with McCarthey and the red scare where people were randomly accusing their neighbors of being communists, the 60s were innocent black men were put to death by lies and rumours of committing crimes they didn't commit leading to the formation of radical hate groups like the black panthers etc. These crimes are not being committing by first gen immigrants but second gen due to being disaffected and not feeling as if they belong. When people don't feel like they belong, they can easily be manipulated into becoming part of a group. That has been happening in the African american community for years with gangs, the second generation Hispanic youth with gangs as well, and now subsequent generations of Arab/Persian Americans with joining Islamic fundamentalist groups. Even the caucasian community is seeing an increase o You want to mitigate these problems you need to integrate them into the community and give them a sense of belonging and worth so they actually care about the people around them.