If you have any decency, get rid of most of it, preferably to charities or political causes.
That sort of wealth in the hands of a single person is obscene, and spending it on luxury when there are people starving and homeless in the world is the height of immorality.
Foolish if the goal is to hold on to more money than you could ever need in ten lifetimes to pursue the goal of accumulating more from the work of others.
The cost is just money in this case. It doesn't use rare or unethically sourced materials (at least if you're not a vegan), it advances the biological sciences as a whole and it's something to do for bio grads that might generate a lot of value for society in the future.
Sort of, the local communists, probably without soviet knowledge or support, overthrew the local military dictator. They started unpopular reforms like gender equality and social ownership, people got very unhappy about that, the situation devolved into a civil war and the Soviets decided to intervene to support the Afghan communists.
Not quite a straight invasion like Ukraine and probably more justified than the US intervention.
In fairness, outside of three decades or so in the 20th century, Germany has been one of the nicest places in the world to live in for at least the past 200.
A full military occupation followed by several years of constructing a new government like what was done in Germany or Japan might have had a chance at working. Our efforts were always half-hearted. There were never enough boots on the ground to properly police the population and there was no political will to try.
The Soviets had their go at nationbuilding. Their puppet state survived eight years after they withdrew as well, which is a fair bit longer than the ten days we managed.
Attraction is a chemical process, long term relationships without respect are doomed to failure