You can probably say that crypto is safe if we are in a bull market but in a bear market, no market is safe.
How to tell them? Just tell the truth that sometimes you will gain money (safe) and sometimes you will lose money (not safe) because that is what investments are. Just saying to newbies that events like this are normal in any markets and just by be patient will make them comfortable because right now, people are in an extreme fear. As a newbie, saying to them to stay patient and wait for a perfect opportunity to buy would be the best thing to say to them.
Hence I would suggest that crypto is safe, depending on what you are investing into. I personally believe that bitcoin for example is as safe as it gets, most projects are bad these days but bitcoin has been going strong for about 13 or so years, it's not even a new thing anymore.