Regarding the safety car, I've always thought it's completely unfair - a driver could have driven the race of his life and built up a big lead by being the best on the track, and then a mistake by another driver can mean you don't win. It is a bit ridiculous if you think about it, I'm not sure anything similar happens in any other sport, but then other sports aren't as dangerous of course. All that said, that's what's always happened with safety cars so I think you just have to say really hard luck for Hamilton. I'm disappointed for him but he has had slices of good fortune many times in the past.
That's not to say what happened on the restart was correct, just that it was terrible luck that another driver made a mistake and gave Verstappen the opportunity.
Also, regarding the restart, the alarm bells started ringing for me a couple of weeks ago when the race director was negotiating with one of the teams. It's just wrong. There should be a clear rule and a clear punishment, there should be no chatting with the team to find out what kind of action they'd prefer. To me it showed that the rules either aren't clear enough, or the people that make these decisions have no backbone - or both. If they did take the action on that last lap just to get a racing finish and didn't follow the process, then the warning signs were there and we shouldn't really be surprised even if it is wrong.