Sure BRKA is a better buy now than it was when it was $20K higher. But the problem is that when it was $20K higher everyone was thinking of buying BRKA so it was "perhaps" safer to buy because of upward momentum (with an appropriate downside price stop). Now the problem is that everyone is selling and it's not at all clear when or if we've hit the bottom yet. Momentum is now down in BRKA. I would recommend WAITING to buy till downward momentum has clearly stopped and upward momentum has clearly started.
A famous quote from a very successful stock investor is as follows:
I never buy at the market bottom or sell at market top.
My quote is that in the stock market bulls can make money and bears can make money but pigs can lose all their money.