In America at least, there tends to be far less unity within liberal factions when compared to conservative ones. One just has to point to the last few presidential elections.
2008: There was a significantly tougher struggle between Obama and Clinton compared to McCain and other Republicans.
2012 The democratic party unites around Obama fairly effectively. (Although this is the outlier compared to the last few presidential elections.)
2016: Again, although there was a struggle between Trump and Republican party veterans, but the struggle between Clinton and Bernie was far, far worse.
2020: Trump faced practically no opposition while again the Democratic party was greatly divided via the Bernie vs Biden struggle.
Not even taking into account official elections, there just tends to be way more in-fighting within liberal groups socially compared to conservative ones. Conservatives always seem to be on a united front: Being Pro-Life, Pro-Gun, Anit-Immigration, etc, are common among nearly all American conservatives. On the other hand, there are very few issues that all liberals agree on. Why is this the case?