Wise people never do anything without thinking twice; especially before sacrificing their life.
If a few people in a country died for others just for increasing others' lifespan, would it be good to the country if their (other people's) aim is just enjoying themselves exploiting the natural resources? Do you think the ruler would be the same person always? Don't you know that it will take 'no time' to change the complete scenario? Can't you think that the power that controls the whole universe in micro and macro-level, can solve the problem you stated?
if I should die for others, including Trump, to persist, and perhaps
in order to create laws allowing people to die voluntarily in order
for others to survive.
When you cannot predict your own character how could you predict another person's character? Would the ruler think in the same way you think?
Did you think about the tiny creatures that live because of humans? Don't other creatures have the same right to live in this world as humans? Don't you know truth that the life-style of other countries can affect your country?
You said you wish to live. Then you should think of an alternative. sacrificing your life is not a good solution.
Is it ethical to try to survive on this context?
Even if you blamed yourself (since you began your question with "we"), I do believe you haven't done any mistake. As from an individual's point of view, if you tried to survive, it is never unethical.
The mistakes you made might be trifle when comparing others. If so, you can say that it is ethical if you are going to remedy immediately by doing some good activities for protecting the environment.
Since human community is the villain here, we can treat this as unethical while treating them as a group. But, since we can't blame one particular person for all the evil activities, we shouldn't take this into account.
You may read this https://en.wikipedia.org/wiki/Butterfly_effect
You can find people in almost all parts of the world who wish to increase the population of their own category. In this context you can think over it and verify whether this issue is to be treated as ethical or unethical.