Nothing is ever perfectly safe. Nothing you do ever has no impact. Everything in life is about tradeoffs, and the right thing to do is pick the best one. NOT wait for the perfect one!
Said no poor person ever. You can't just bury your head in the sand and pretend your policies/idea don't impact anyone.
If you understand that and choose to do so anyway because you feel it's better, fine, at least you understand that you are making a tradeoff. But just pretending there is no harm is disingenuous.
...said no politician, ever. This proposition may even be true, but it's a terrible argument.
Are you going to be the person who tells families around the country that their grandmother had to freeze to death this winter for the greater good?
How about the young couple that just had a kid and is suffering from stagnant wages. Are you going to come around and tell them to "tough it out" to prevent a catastrophic event a century or two from now?
All the while the smokestacks in the 3rd world just keep growing, and thanks to the lack of demand in the US they can consume even more petroleum products (and in a far less efficient manner) due to the lower cost globally.
(Also, premature decommissioning for political reasons, (e.g. Rancho Seco)
What are you suggesting, exactly? That each locality can block whatever transport goes through it? Maybe put up a tollbooth?
Coal isn't safe either, nor nuclear, hell even with solar someone might fall off a roof during maintenance or installation and the panels can be toxic. What perfectly safe energy source do you propose?
If the pipeline is safe, prove it. If the trains and trucks are safe, prove it. If neither, then leave the oil in the ground.