Those seeking for short term profits should just stay way from bitcoin investment, for Bitcoin investment doesn't give short term profits, where those category of people belong is cryptocurrency trading and not bitcoin investment.
But the problem is that seeing rapid growth during the next bull run, newbies begin to believe that this will continue forever and get burned on this. Newbies want to make a profit here and now, and the growth charts of bitcoin they see will only confirm their erroneous beliefs and expectations about easy money. Blinded by this, newbies will be deaf to your recommendations.
Those who are lacking emergency funds, living in paycheck to paycheck, and struggling with depts should just avoid bitcoin investment or they we end up investing nothing but regret, because they can never accumulate a good portion of bitcoin to hold for long term, or they we end up selling their bitcoin investment at early stage, because of emergencies that may arise along the line.
This category of people should avoid investments in general, because without excess financial resources, there is no point in investing, because it jeopardizes the current budget. Investments (in bitcoin) are the case when the user has reached such a level of income, when the budget covers all current expenses and there is a surplus (minus money set aside for compelling force), which should be saved in the long term (from inflation).