It was 100% possible to genuinely hold the belief that "Silicon Valley Bank is safe" and to advise portfolio companies to remove money to reduce risk.
In-fact, that looks like it was the prudent way to behave: depositors probably haven't lost their money but it sure is a lot less liquid.
And this is exactly why bank runs are dangerous - once there is risk of one the safe thing to do is to remove your money as well. The only way to stop one is for an institution with a LOT of money to step in an guarantee it.