If only there was some way to make sure people didn't just have access to the weapons they need to successfully perpetrate a hostage situation... almost as if the glorification of weapons and the military is at the core of this eh?
It helps to play the "why" game and physically draw your connections (especially since you want to travel down certain paths after you have have gotten to them and there's going to be a lot to keep track of). Certainly removing guns can be one part of the solution, but it clearly isn't the only factor contributing to "people getting shot" and is really a lazy way of trying to solve the problem by presenting this as the one and only way to resolve it. Complex problems require understanding the whole chain (or a good portion of) to resolve and the over simplification just causes us to fight and continue our 30 years of debate that has not deviated or grown despite the problem having.
I'm sure there are situations where a swat team is genuinely needed, but I'm also sure those cases make up an extremely small percentage of the times they're actually used. In any case, if police are called out to an innocent person's house and they kill the innocent people there it shows pure incompetence on the part of the officers involved. A little restraint and a lot more training would probably go a long way to preventing tragedy.