Medieval siege, standard thing.
Cromwell in Ireland? Again pretty standard for the time period. Also somewhat overstates, given that Cromwell was pretty clear on the whole "Surrender or die" thing and a lot of the accounts feature artistic license.
Again, standard both before and since. The death sentence was given for far lesser crimes at the time, and was the correct penalty for mutiny.
Military measure, and again nothing special by the standards of the day. It's also worth noting that part of the reason conditions became so bad was because of the logistical difficulty of supplying the camps over an undeveloped country whilst Boers raided the supply routes.
Indeed, not a good thing. Then again, not a world apart from contemporary events in Europe.
It's also worth noting Dyer lost his career over it, and that contrary to that picture, the troops were not British but rather Indian themselves.
Another thing that's very much standard for the time. Also very little problem behind it. There was a war to be won, strategic bombing helped win it.
I've already dealt with the Mao Mao.
Well again, it's a case of counter-insurgency being a messy business.
As with most of these I'm not suggesting it's a good thing. But the thing about these atrocities is that they really aren't that out of line with standard happenings for the time. That's not me advocating for them (aside from strategic bombing, which I still suggest was the right thing to do), but it does mean they're hardly so massive as people sometimes make them out. The trend in modern interpretations is to make the British (and every colonial) Empire seem like some pseudo-Nazi genocidal maniac state, which simply doesn't fit with what occurred.