In what way do you consider birth control unsafe?
There are many unsafe contraception methods. In many parts of the world, continual administration of poisons, (to keep women in a health state where they are simply incapable of procreating), or abortifacients, "application" of damaging devices/procedures, and DIY/backstreet abortion are regarded as normal and acceptable birth control. I have travelled in many wild areas of the world, and seen a lot of crazy things.
In a lot of places, sons are great, daughters a burden, in the same regions, the birth rate of males against females is very high - coincidence? Post natal birth control.
It is, however, likely that in most western countries, this is not an issue, although there is some evidence that several hormonal treatments
might be implicated in several female cancers and other disorders.
In most of the same western countries, declining birth rate is seen as a major problem. An aging population expanding because of increasing medical technology, is being supported by a shrinking wealth creating population. Who is actually paying the pensions?
Globally, I believe part of the problem is the increase in medical support in remote areas caused by well meaning agencies that "save the children" at all cost, whilst neglecting the essential sidekick. If a people are used to having half of their kids die young suddenly have all their kids surviving, they run out of resources to support them, it is inevitable. Nature had previously limited the population, we skew it, and the result is famine under whatever disguise it is using this week.
With health care comes the duty to educate, that includes birth control - this is sadly often missing in the programs of these organisations. It is much easier to get donations when they can present a screen full of suffering kids then to admit that they have caused the problem they now strive to solve.