I would say that you should check first the potential of your asset, if your asset is giving you profit then don't sell it and better use your emergency fund since it can be replenished by the profit of your asset. But, if your asset is just idling, and does not give you any profit then it is not bad idea if you sell them. You can always buy the same asset once you have a better income in the future.
Yes, always double check what would be the outcome of the decision you will be making like you said. I think if you already have profit or you could say passive income, why not use it for investment since it's like a spare money. Don't forget that emergency funds is important for every happenings in life so just simply using it at risky scenario wouldn't be a good idea at all. If you're profiting enough just 50/50 it.