many incidents? yes, one is one too many but - come on. Your first example was in 2005, 19 years ago, the second was in 2011, 13 years ago.
Most people would want a balanced approach to this - tazzer if possible and safe for the police and the public to use it, but some situations require the use of lethal force!
That is my view too. I would be quite happy if all police were to carry tasers, as the risk of innocent bystanders getting killed by a taser is negligible. But use of guns should be a last resort, due to the risks to others. For an attacker armed with a knife, a taser would seem a more proportionate response than a gun in most instances, for example.
We currently have very few incidents where someone is wrongly shot, because the police rarely use guns here in the UK, but even so they have happened. If use of guns was made the routine response to armed attackers, as proposed by the poster I was responding to, then such incidents would inevitably increase.