The logic for investment is buying low and selling high and currently Bitcoin has a new ATHs is it safe to encourage new investor to buy now seeing how high the price has gone? My fear for new investors is that the don't experience a dip after buying since no one is sure of how far the new highs will reach.
Actually not advisable cause price can fluctuate so hard close to their early price. This happened when the market experience crash or really bad day from fuss and uncertainties. New investors entering a high price could lose a lot of money but also they could end up regretting not to enter since price could still sky rocket. No one can turn back time to bring back the price of a token with a very cheap price, but hence no one want to lose either. Its a risk that anyone should be prepared of.