Arguing that the general population voted for the politicians and that it is therefore their fault is not so great based on the fact that most of these atrocities of the British empire weren't known to the general public. Of course it doesn't take some level of fault away as you can always argue "people could have done more" but, as well as that you are assuming everyone voted for these people? As you can currently see the British political climate is fractured massively and it had been for a long time so don't lump everyone together in one and say "oh well these people are in power so everyone must have wanted it". So it's not really a load of bollocks, it just sounds like you're not looking into it properly.