Then you are the same as me. The I Ran Away is quite documented even with interviews of alleged IRA men at the time.
As you know the troubles started before 1969 and it was 1969 when it got so bad that the troops were sent there for Catholics protection. You mention 1970 that was almost one year later.
Also as you will know. 'Terrorism' was the new thing then that no governments had any knowledge of and little ways of dealing with. The PLO and all the others were hijacking planes etc.
Together with that you had nut cases like Idi Amin and Colonel Gadaffi who hated Britain and the west and were only too pleased to supply anyone who said they were against them with anything they wanted. Then the PLO trained them in the desert.
It was a situation which was going to explode and the rest is history.
Over 3500 deaths and more maimed and whole families and communities destroyed.
None of it was an 'Invading' army. It was down to a whole lot of circumstances all coming together at that time.
You can try and blame who you want. All parties on all sides were just reacting to what was going on around them and 'others' were only too pleased to stoke the fires.
I don't understand why you are placing such emphasis on the IRA were known as 'I Ran Away' in Belfast at the start of the Troubles. Perhaps it would have been better for all if they had continued as 'I ran away'.
Once again, it was the Stormont Government that requested the British Government to send troops into Northern Ireland. For the record, the Civil Rights People and the Irish Government wanted UN Peacekeeping troops in. That would have been a much better solution.
The timescale as to when the catholic population turned against the British Army.
August 1969 -Troops arrived. July 1970 - Belfast Curfew (4 civilians killed, 78 wounded and 337 arrested). As you probably know, tensions tend to heat up during the marching season.