I can understand that you are upset. Yet I think that there are reasons that some people speed run strikes. For instance, exotic bounties such as the one for bad juju require that you need to complete 26 strikes. That's a lot of time wasted for people who are going through that. (Its also better than having people afk and leech your strike missions). One solution is to get a group of friends who enjoy taking their time and having fun as opposed to random matchmaking if you want to avoid speed runners.