Quite a few things that couldn't really be planned seemed to have been banked on and worked out in that scenario. I mean the thing could have escalated earlier and would have been all done before the cops came over. The cops could have been there way earlier (as you mentioned). Escalation might not have happened in the fashion that it did. Etc.I did too, though Mike took a chance that a police car wasn't close by when he called.
That said, it's entertainment, so we sort of expect things to work out or lead to something even if in reality it's a risky thing for most to even consider let alone try expecting it to work out exactly as planned/expected.