Earlier quoted context omitted.
Ingesting too large amounts of caffeine is almost certainly bad for you. It's a stimulant that increases your blood pressure and heart rate. You don't want to overdo that. It's also diuretic, if you substitute water for coffee (which some people do) it can actually lead to dehydration. But yes, I agree to your larger point that coffee is less dangerous than alcohol.
>It's a stimulant that increases your blood pressure and heart rate. Does it do that to a significant extent to regular users, though? I thought the stimulant effects mostly went away once you build up a tolerance. Similarly, there is little diuretic effect for regular coffee drinkers: http://www.bbc.com/future/story/20140402-are-coffee-and-tea-...
As to stimulation effect for regular users... I guess it might depend, but for me, I do notice when I drink too much coffee. And I am a "regular user" - I'd say I drink around 4 espresso a day (which is not a problem, but if say I bump that up to 10, I definitely feel it)