[umanwizard]

Why would you expect them to encourage people to put the money into the stock market?

If the government wanted to print money to make the stock market go up, it could do so directly. That's not the point of giving money to all citizens.

[jka]

The concern is that an artifically-created economic recovery could be a political goal, and might not align with the interests of humanitarian response; nor indeed with longer-term genuine economic recovery.

You're no doubt correct that the same result could likely be achieved in other ways too.