Final answer:
The real Tsar was undermined by issues such as the power of Rasputin and Tsarina Alexandra's unpopular decisions. The rebels sought to replace the autocratic government with a more democratic or socialist regime, and the assassination of Alexander II highlighted the extremes some would go to enact change.
Step-by-step explanation:
After six years, the real Tsar was in a position where his power and the faith the people had in him were severely undermined. The issue the rebel groups had with the tsar's government mainly stemmed from the widespread discontent with the autocratic ruling and the influence of Rasputin over Tsarina Alexandra, especially after Tsar Nicholas II went to direct the fighting during World War I.
Rebel groups opposed the tsar's autocratic rule, aiming to replace it with a more democratic or socialist government. The assassination of Tsar Alexander II by radicals who sought more revolutionary changes exemplifies the desperation and extreme measures some were willing to take.