That's the only thing I disagree with in your post. SWAT-teams should not exist, period. The hostage and "where *extremely* violent people are directly involved" situations should be handled by the militia, that is the armed body of the people, and not that of the police. (Precisely because of the propensity to use SWAT for more and more, thereby devaluing the innocent-life more and more [because every SWAT action is inherently more lethal].)
We all know how that worked out.
Now even small rural towns have militarized units, with attitudes of an occupying army. This should have never been allowed to escalate to what it is today.
They use any excuse to use these government militarized units and these operations are now conducted hundreds of times per day in the U.S.