"Because if Hitler had not existed, then maybe people would actually found the solutions to those problems, instead of this rabid racial hate and eugenics mentality."
That's a very big "maybe". Many people would say that WW2 made the world see that such wars should never happen again and has actually united people.
"I mean an african doctor is just as good as a chinese doctor, if he is a good doctor."
No, no, no. Culture and upbringing is very important. As an example, the doctors in Slovakia are very well educated, but some of them are arrogant and downright abusive towards their patients (foreigners don't generally see this because doctors grovel to rich English speakers).
The welfare system? That is one of the things delaying my return to the UK. As an Expat, I will have no right to state resources, but will have to pay the higher prices generated by the welfare system - higher rents, council tax, etc.
Dismantle the welfare system? That's a big one!