To go back to the first questions I just want to add a link to Vladimir Moss's book The Theology of Eroshttp://www.orthodoxchristianbooks.com/downloads/149_THE_THEOLOGY_OF_EROS.pdf
This book gives a great deal of explanation with regards to sexuality and what is sinful and what is blameless. My understanding has always been that abortion is NEVER acceptable, conception of a child is blessing from God, contraception is an issue for discretion and marriage should precede sexuality. From what I recall from the Canons of St.Basil when young people are involved sexually before marriage it simply states: "let them be married lest they fall into greater sin." However it does not, from what I remember, specify any time period of penance as it does for other sins and masturbation is given a penance of two years! I think adultery carried a penance of seven years. Now of course such penance time periods are different today but I think that this can tell us that the Church can exercise leniency to those who fall into the sin of sex before marriage. Please pray for me and forgive if I am mistaken.
I used to have a much stricter and judgmental view on these issues but human beings are all weak in some ways and often overwhelmed by passions especially when in love. Perhaps this the reason for such leniency while those engaged in sexual acts purely motivated by selfish desire for pleasure which often result in objectifying the opposite sex and even deception of others and yourself are judged so harshly.
With regards to murdering abortionists and people who are having abortions I think that killing them is more extreme and here is why:
You may not want to think about this but there are a lot of young girls some even 11 and 12 years old pressured into sex by older boys and much worse by family relatives. I can think of one case where I knew the man who was convicted by overwhelming physical evidence of raping his eleven year old daughter! When they get pregnant they are likely to be pressured into having an abortion by others. Is this young girl guilty of murdering their child in the same way an adult who was simply promiscuous is?
Now as to the abortionist: Many of them think about cases such as above, or think about all the abused or neglected children or children of abusive or foolish parents and think that they are preventing such things from happening by providing the "service" that they do. They have lied to themselves against science that they are not killing a baby. They think, "Well it's really not a baby until at least after the first trimester and the vast majority of abortions are during the first trimester so it's really not murder." Now this last part is offensive to us but that is how I think most of them view it. That they are helping innocent women and keeping child abuse and neglect from happening. I agree that it is always murder but I just can't bring myself to support killing them. Maybe if that was the only way to stop women from getting abortions but I just think that the way it is so easy for them to convince themselves that they are not committing murder makes it too extreme.
As for genocidal tyrants:
Open rebellion and killing of such must be motivated by a real just war to overthrow and impose a just authority. I do believe in the Just War. It is unfortunate that seldom are wars truly Just or even close, especially now, and even in Orthodox countries this has been true. At the end of the Time of Troubles the False Dmitri II was defeated and his 3 year old son was murdered along with his wife!
God help me I would kill a genocidal tyrant if there were no other way. I would've killed Idi Amin, Saddam Hussein, Joseph Stalin or Adolf Hitler with little qualms. But what would've happened? Would an overthrow and change of power take place? Yes I probably would still kill such madmen but would rather overthrow their evil government's entirely.