Yawn.
Don't confuse terrorism with mass shootings, of which you yanks have has over 1000 recorded since Sandy Hook.
You cannot stop terrorism by implementing more gun control in the USA. Nor can more guns stop it. You are fucked.
However you CAN reduce gun deaths and possibly mass shootings by implementing more gun control in the USA. But it seems that you don't care about that.
An emotional teenager, an angry husband, a disgruntled employee. This happens every single fucking day in Australia but nobody grabs a gun and kills someone for hurting their feelings. If butt-hurt still exists after a day then maybe there will be an assault but it won't be deadly unless the persons involved have a mental illness.
God Bless America.