Just like private businesses, this will not stop until they’re held accountable both civilly and criminally. SWAT teams are needed and the training is warranted and required. However, their overuse is absolutely ridiculous and as is the case in Arizona and the Pima County SO, people will die for no reason. There are much better and more efficient ways for police to operate, the last of which should be a military style entry into someones home. Especially the wrong one.
Swat teams are not needed, and never have been.
The situations for which this is appropriate (strictly a subgroup of armed hostage situations where the perp is known to be highly skilled or paramilitarily armed) are rare enough that the use of national guard MPs obtained by going through the state governor provides an adequate force. That used to be what was done.
It is not done this way now simply because state governors are directly accountable to.the people, and the left wanted a force available somewhat sheilded from the voters.