Russian Ambassador was a victim of faith or strategy

I am not totally convinced how easily the Russian Ambassador to Turkey Andrey Karlov, 62, was shot dead by a  gunman, for the Syrian issue. The whole story seems to be very easy to accept in terms of how diplomatic world has started taking their security so easily especially for a country like Russia that is considered to be world's developed nation.

The assailant identified as Mevlut Mert Altintas 22-year-old assailant was also shot dead by the police where he shouted “Don’t forget Aleppo. Don’t forget Syria!” after shooting.

The things that are very fishy are

1. Why was the security of the Russian Ambassador so vulnerable?
2. There seems to be a big security loop hole as it looks very staged 
3. The Syrian issue certainly points out a definite issue of tension going on in-between Russia and Syria which is totally uncomfortable to accept 
4.  The culture and religion issue 
5. This man is young, so how come he handles the crisis situation so well, I mean to say he seems to be very well prepared and he has all his markers ready

Killing anyone in any name of country, religion or any form of discrimination is wrong by anyone. Human Rights are the basic standard code and right of every individual in this earth which needs to be practiced at all times with respect.